Murder the Hypotenuse



""As I told Lady Freeze when I pulled her plug, this is a one-woman show.""

- Poison Ivy, Batman and Robin

Love Triangles are tricky business. Trust us, we've already done the math.

It can get particularly twisted when some sides of the triangle are completely one-sided. Bob is in love with Alice, but Alice not only fails to realize it, but is already in a relationship with Chris. This is a classic recipe for drama (or humor), but sometimes, it goes too far.

Sometimes, somehow, Bob gets the idea that Chris is the one in the way of Bob's happiness with Alice, and if Chris were to somehow have an "accident", then surely Alice would come to love Bob instead. It's true -- Love Makes You Evil.

Not always the best thought-out plan, no. Sometimes, Bob may not even consider what would happen if Alice ever found out. If this isn't The Reveal for a Yandere (disambiguation), it's still her most shocking moment.

Compare Opposites Attract Revenge. Contrast I Want My Beloved to Be Happy, which may be subverted into this trope, and vice versa. Also compare the Scarpia Ultimatum, where the threat to murder the hypotenuse may or may not be carried out. Contrast If I Can't Have You, for when it's the Cathetus (Alice, for those a little rusty on their geometry) that will be murdered. If this is done indirectly by setting the hypotenuse up to be killed, it's either The Uriah Gambit (if Bob does it intentionally) or Death of the Hypotenuse (if the intent is limited to the author).

When the fanfiction writers do this, it's Die for Our Ship. If the hypotenuse is a friend, it's Friend Versus Lover. If the character kills him/herself instead, it's Spurned Into Suicide.

Note that the triangle must be a right triangle for this to apply. If it is an equilateral triangle, the Tenchi Solution occurs, though if you have a Psychotic Love Triangle going on, things may still not end well.

Anime and Manga

 * In Mirai Nikki, it's shown very clearly that Gasai Yuno would be all too willing to kill ANYONE who got in the way of her "love" with Yukiteru (including his mother and father).
 * Why sugarcoat it? Yuno is even willing to kill anyone who is less than ten feet away from Yukiteru simply because they are less than ten feet away from him.
 * Heck, she's even willing to kill Yukiteru AND HERSELF just to be with Yukiteru. Essentially, if she doesn't kill him the world will end and they will both die.
 * A less lethal version of this seems to be executed by Akise Aru, who has a crush on Yukiteru. He
 * Chapter 50 seems to have confirmed this. . In the following chapter.
 * The ending to the School Days anime, where violently Murders The Hypotenuse,.
 * This was reversed in the manga, where, and in some new bad endings of the PlayStation 2 game. In one of these,  Another strongly hints that  CREEPY...
 * And taken Up to Eleven in another bad ending . Which is kind of an Ironic Echo to the original Bad End
 * This is often the path villains take in Sailor Moon. Beryl, Ann, and Black Lady try to kill Usagi to get Mamoru, while Al and Diamond try to kill Mamoru to get Usagi. Emerald also tries to do in Usagi to win Diamond.
 * Fiore in the R movie tries to kill Usagi both because she is Sailor Moon and out of jealousy over Mamoru, whom he is attached to because of how kind he was to him when they were kids.
 * Also invoked by Al and Ann from the Makaiju Filler Arc, especially in the end when
 * Sae from Peach Girl hates Misao for being the one Ryo loves since she loves him herself and, at one point, tried to push her into the path of a moving bus. However, Kairi restrained her at the last second so she wasn't able to.
 * Kairi's trio of Clingy Jealous Girls absolutely hate Momo for winning Kairi's affections. They make a habit out of harassing/threatening her, once deliberately made sure she got separated from Kairi and was stranded during a class trip, push her into the path of a camp fire when she was holding cooking oil, and, at one point, held her down, and told her that she has to sign a contract swearing that she'll stay away from Kairi or they'll burn all her hair off (while holding a lighter to her hair), and try to beat her up later on when she states that their selfish and cruel actions won't make Kairi fall in love with them, and when she tells them that her love for Kairi is genuine. In addition, they take the threat even further with "We'll burn your face so badly that Kairi won't ever look at you again," and "Don't worry, we'll push you into the pool before your whole body catches fire."
 * Peacemaker Kurogane: In the manga, Suzu comes to this conclusion when Ryoma decides to take Tetsunosuke away from him.
 * Code Geass: does this to, not because of her connection to Lelouch, but because he wants to kill  and stop her from coming between him and Lelouch.  was an obstacle in making that happen, as she told Rolo that she wanted  and thus she had to go.
 * Also, Mao's treatment of Lelouch seems this way at first - C.C. abandoned Mao and made one with Lelouch instead. So Mao tries to kill him  Somewhat averted in that
 * Also V.V., who looks like a kid but is Really Seven Hundred Years Old, became psychotically devoted to his younger twin brother Charles after their mother's death and out of jealousy when they started getting too close.
 * Ranma ½ makes good use of this trope, given it's base is a mixture of Arrogant Kung Fu Guy and Love Dodecahedron. Fanon, however, tends to greatly exaggerate it for various characters who have used it or hold similar attitudes.
 * Tatewaki Kuno: Has never actually tried to kill Ranma for Akane or "the pigtailed girl's" hand, and doesn't even seem to want to kill Ranma in their fights. His attitude of "if I beat up Ranma, then the girls I want will naturally flock to me for proving my studliness" does fit under the general umbrella of this trope, but lethal force is not his intention. Though... there is the way he starts swinging around a live steel katana instead of his bokken during the Tanabata and Failed Wedding stories, which probably inspired his fanon reputation.
 * Ryoga Hibiki: Has no connection with this trope at all. While it is argued over whether or not he did actually want to kill Ranma during his first story, even if he did, the cause was over Ryoga's curse, not Akane Tendo. Any murderous intentions Ryoga might have had were gone by his second story, anyway. Whenever Ryoga attacks Ranma because of Akane in all subsequent stories, the general cause is "protect Akane" or "punish Ranma for making Akane angry/sad". The one time Ryoga did try to kill Ranma was when he accidentally caused Ranma to fall in love with him, which made Ranma act in the same way that Ranma's own "openly affectionate" fiancees act towards Ranma. Ryoga did admit to himself that Ranma being dead would leave Akane "free" to his courtships, and had an Imagine Spot while digging Ranma's grave about Akane confessing her love for him on that very spot, but his initial and primary motive was purely disgust with/fear of Ranma and Akane's "falling for him afterward" provided additional motivation. However, at one point he did plan, together with Mousse, to accompany Ranma on a dangerous mission against a quite murderous villain just to make sure he killed their rival in the process (and conveniently seal away their curses while they were at it.)
 * Kodachi Kuno: Joined in with Ukyo and Shampoo in attacking Nabiki during the "Nabiki, Ranma's New Fiancee" manga arc, in hopes of killing her and taking him for herself. Similarly, teamed up with them to beat up Miss Hinako during the manga arc she was introduced in, as she suspected the teacher was trying to seduce Ranma. She did show at the Failed Wedding in a wedding gown of her own and planning to marry Ranma herself, but wasn't slinging bombs around like Ukyo and Shampoo.
 * Ukyo Kuonji: Generally prefers more "nonviolent" approaches to trying to win Ranma, such as setting Akane up on a date with Ryoga, trying to lure Ranma & Akane into a magical Kimodameshi that will supposedly break them up irrevocably, or agreeing to let Ranma stay at her home after he is kicked out (and, later, to let him use her business as a wager on the condition he will join her in resuming her travels if he loses it) in hopes that this will make him "realise how perfect she is for him". However, she can go about it violently as well; she willingly joins in with Shampoo and Kodachi when they attack Nabiki with plans to kill her and then fight over who gets Ranma, and is the one who suggests Hinako might be trying to seduce Ranma and leads the other two girls in ambushes on her. She shows up at the Failed Wedding throwing bombs, though possibly at Ranma rather than Akane, and wonders why she didn't think of it herself when Kodachi reveals her plan to use this ceremony as a way to marry Ranma at last. In the anime, though the aforementioned attacks on Nabiki and Hinako are removed, Ukyo plots to herself about killing Akane when she asks for her help in the second of the "One to Carry On" Filler OAVS and begins throwing random heavy objects at her, growing angry when Shampoo throws something at her and leaving a clear impression she thought that she and Shampoo would work together to kill Akane, and then finish fighting each other.
 * Shampoo: Given she stated "obstacles are for killing" when Ranma tried to prevent her attacking Akane for Ranma's hand in her first story, it's understandable that she gets hit with this trope the most -- in canon and in fanon. Fanon usually overstates her actually trying to kill her rivals, though. Canonically, while the idea doesn't seem to bother her in the slightest, it isn't something she tries all of the time. Notably, when she first thought Akane was an obstacle to pursuing Ranma's hand, she actually just wiped her memories of Ranma. Then, when it looked like Akane might be breaking through the memory block, she tried to strengthen the block, only attacking after Akane did break through the block and kept interfering -- and even then, she stopped attacking Akane the moment Ranma told her not to. After that, though, she tried to give Akane a Jusenkyo Duck curse in order to "pawn" Mousse off on her, plotted to murder Akane and pin the blame on Taro in the first Pantyhose Taro story, was the first to suggest attacking Nabiki during her stint as Ranma's fiancee in the manga, joined in Ukyo's plot to beat up Hinako in the manga, came up with the same plan as Ukyo in "The One To Carry On, Part 2" and wrecked the plan by attacking Ukyo first instead of Akane... the final manga story arcs, Jusendo and the Failed Wedding, had a Brainwashed Shampoo (who, given she was obediently sent to murder Ranma, even if she did muster some Villainous Willpower to try and wriggle out of obeying, was arguably Brainwashed and Crazy) threaten to pop off the dollified Akane's head and a normal Shampoo attack Akane & Ranma with bombs at the wedding ceremony.
 * Mousse: Introduced to the series specifically challenging Ranma for the right to Shampoo's hand, threatening to take Akane if Ranma couldn't beat him. On his return, attempted to murder Ranma by using him/her as the target in a knife-throwing act (Ranma managed to catch the knives in her teeth) and then chased him around the circus throwing daggers and water balloons full of Jusenkyo Duck water at him. Shortly after that, he kidnapped Akane and threatened to douse her with said Jusenkyo water, in reality planning to either murder or curse (whichever came first) Ranma when he raced to Akane's rescue. He then challenged Ranma to yet another duel to win a date with Shampoo. Repeatedly throughout the series, Mousse challenges Ranma to fights because, like Kuno, he thinks that beating Ranma will make Shampoo fall in love with him -- unlike Kuno, Mousse doesn't seem bothered by the idea of killing Ranma if that's what it takes to win, though he has never actually "won" except in fights where he had other things on his mind and so passed over the opportunity to deliver the coup de grace.
 * On the topic of Kaishaku's works, an interesting case of this occurs in Shattered Angels where resident Psycho Lesbian Mika Ayanokoji tries to sacrifice the hypotenuse. Ultimately it's cut short before anyone's sacrifices, but is ironically turned around when Mika is killed off rather nicely.
 * Kish from Tokyo Mew Mew is a stalker who constantly attempts to get rid of Ichigo's boyfriend Masaya. He even attempts to kill Ichigo herself if she refuses to become "his".
 * In the second to the last episode of Mobile Suit Gundam 00,, who is in love with  , attempts to do this to   Luckily,   is there literally (their mechas anyway) just behind   to prevent it. He tried to do it directly,
 * A mildly-popular theory that was ultimately Jossed by canon invoked this, via speculating that
 * And in Mobile Suit Gundam ZZ there's Beecha, who This is due to Beecha's jealousy over Elle swooning over Judau and the feeling that he needed Judau out of the picture to make himself look like a better match for Elle.
 * Subverted in Hell Teacher Nube.
 * In Mai-HiME, Shiho Munakata is in love with her childhood friend Yuuichi Tate, who's in love with Mai Tokiha. When Shiho comes to believe that Mai is stealing Tate away from her (more due to Tate's actions than Mai's), she attacks Mai to keep her out of the way permanently, which isn't helped by preying on Shiho's insecurities later.
 * Psycho Lesbian Tomoe from Mai-Otome wants Shizuru, and is perfectly willing to harm or kill anyone whom she perceives as a threat to her ultimate goal. This leads her to do nasty things to Arika, whose Fan Girl crush is seen as stealing away from any attention that might otherwise have gone to Tomoe. On top of that, Arika isn't even a real contender in this Love Triangle - that honor goes to Natsuki, Shizuru's boss.
 * Played with in Speed Grapher.
 * In the Rumiko Takahashi one-shot Laughing Target, the protagonist has a cousin to whom he made a Childhood Marriage Promise. However, he eventually grew up, moved on, and started dating a girl at his school. When the cousin moves in with the protagonist (after her mother's mysterious death), it turns out that she hasn't moved on - and she's very unhappy with the new girlfriend for taking what's rightfully hers...
 * The whole plot of Area 88 is that Shin's (now former) best friend ships him off to a war in the hopes that he'll get killed, so he can marry Shin's girlfriend, the daughter of his company's CEO.
 * Creed from Black Cat does exactly this to  when Train started developing a deep friendship with her. When that didn't manage to convince Train to come to him, Creed decides that it is now Train's Heterosexual Life Partner's fault and tries to kill him. He tries to do this to   later in the series.
 * Genkaku from Deadman Wonderland attempts this twice with the girls he thinks Nagi is interested in. He stabs Karako when she gives Nagi a Cooldown Hug, calling her a "shitty girl," and telling her not to touch Nagi. He also is shown to be very agitated and jealous when he insinuates that Shiro is someone close to Nagi, saying that Nagi "never learns," and that he'll just have to punish him again (which he tries by attempting to have Shiro and Karako raped). It's especially interesting to note that he was also the one that killed Nagi's wife in the beginning.
 * Masaru "Chaplin" Sukegawa was imprisoned after murdering a woman his lover was caught with.
 * Full Metal Panic!. When it comes down to it, this is pretty much what  tries to do to Kaname, because he's angry that Sousuke fell in love with her.
 * In Higurashi no Naku Koro ni, this was Shion's solution to the problem that her crush Satoshi was spending all his time caring for his little sister Satoko and not realizing the Yandere (disambiguation) existed (Literally. She always made a Twin Switch with Mion before they talked). And this is when she was sane, when she snaps It Got Worse and she decides to Kill'Em All
 * A variant of sorts occurs in Fist of the North Star in regards to Shin, Yuria and main hero Kenshiro. Shin is in love with Yuria, who is in a relationship with Ken. The variant here though is that Shin seems relatively self-restrained... until Jagi, Ken's arsehole brother, comes along and convinces Shin that Ken is too weak to protect Yuria and that Yuria would end up dead if she stayed with Ken any longer. Result? Shin and Ken fight, Ken loses, Yuria declares her false love for Shin to spare Ken's life and he takes her to his Southern Cross kingdom and some time later, Ken confronts him there. Fans know how the story goes from there.
 * Loli and Menoli of Bleach attempt to do this to Orihime due to their boss having an interest in her powers.
 * Rukia's, and to another extent her , from the third movie wanted to kill all the Shinigami to keep them from coming between them and Rukia.
 * Orihime's hollowfied brother Sora also qualifies, trying to kill Ichigo (and Tatsuki, though less so) for taking his place in Orihime's heart.
 * Angel Sanctuary: That's pretty much the motivation for Rosiel's schemes against Sara. Alexiel won't wake up permanently (shows up in moments of need but always gives back the control to Setsuna) because her current reincarnation is extremely happier. So Rosiel figures that if Setsuna could not be happy anymore... And yes, Rosiel and Alexiel are brother and sister, but that barely matters to the point of this trope. And even if it did, Sara and Setsuna are too, but that didn't keep her from being overjoyed when
 * And on a straighter example, Layla set up her (successful) love rival to be killed by the man they both loved. Pretty cruel for all of the involved.
 * And while Raphael doesn't actually try to kill Setsuna, he does make it very clear he'd be glad to step in should Setsuna die.
 * Suruga from Bakemonogatari is infatuated with Hitagi. So much so that she starts stalking Koyomi after he hooks up with Hitagi and tries to beat him to death twice. Doesn't manage only because of Koyomi's amazing regenerating ability.
 * Sort-of subverted in Inuyasha, when Koga first decides (completely unilaterally and over the course of about five seconds) that Kagome is "my woman." Upon realizing that Inuyasha is possibly in the way, Koga cheerfully proclaims that he will simply have Kagome by killing Inuyasha. He proclaims this to Kagome. He's blissfully unaware that she might have a problem with the idea. (He doesn't actually do it, of course, or even really try. But the logic is the same).
 * Played straighter by Onigumo/Naraku towards Inu Yasha re: Kikyou. It's a little iffy due to the majorly conflicting motivations between his human and youkai sides, which hate each other as well.
 * Kikyou once tries to murder Kagome because she is "in her way", and attempts to drag Inuyasha to Hell with her. She loosens up as her rage at the world disminishes and then she focuses on destroying Naraku for once and all.
 * GetBackers: Takuma Fudou to Ginji, over Ban. "When you're around, Midou doesn't even notice me. Midou's eyes are not on me... because you're in the way!"
 * Kazuki's gang, Fuuga (lit. "Elegance"), is really into the Ho Yay. There's some kind of Toshiki/Kazuki/Juubei Love Triangle, apparently; Toshiki even attempts to Murder the Hypotenuse, claiming that Kazuki never paid any attention to him when Juubei was around.
 * Jegan fakes this in Rave Master. He kills everyone but the other two members of the love triangle (since he happens to be friends with the guy his crush liked more) then convinces each of him that he killed the other.
 * Outlaw Star: Harry tries to do this to Gene at one point in episode 21 in order to take Melfina for himself.
 * Baka to Test to Shoukanjuu: Miharu's reaction to seeing anyone trying to come between her and Minami (who is not even interested in her) is to chase that person down and try to kill them.
 * Mizore in Rosario + Vampire tries to kill the rest of Tsukune's harem and turn Tsukune himself into a popsicle so she can have him all for herself. However, once she's added to the harem she becomes friends with her love rivals and continues to stalk Tsukune. She says herself that she doesn't really "need" to stalk him anymore, it's just "more fun."
 * Neon Genesis Evangelion: Naoko Akagi was sexually involved with Gendo Ikari after the death of his wife Yui Ikari, though it is suggested that Naoko wanted Gendo before, as she described Yui’s disappearance as being exactly what she’d hoped for. Naoko still strangled the first Rei Ayanami when the child said that Gendo considered Naoko as an "old hag" and no longer useful (Rei’s resemblance to Yui might also have been a factor, as Yui’s face appears superimposed over Rei 1’s as she speaks to Naoko). She was later horrified that she had done so and committed suicide.
 * Also, Ritsuko Akagi was romantically involved with Gendo, as her mother Naoko was before her. However, she eventually realizes that Gendo is using her in the same way that he used her mother, and that he cares about Rei more than her, so she likens Rei to that of a romantic rival. In the manga her disdain of Rei is more evident: at one point, during one of Rei's medical checkups, Ritsuko loses control after Rei rebukes her and tries to strangle Rei to death. Realizing that she was acting like her mother before her, she stops herself from killing Rei, but warns Rei against telling anyone what happened. She also destroys the Rei clones in a bid to get at Rei and Gendou.
 * Sakura Gari: Sakurako and Katsuragi both try to do something of the sort to Masataka in order to have Souma for themselves. And Sakurako spends a good amount of her time trying to drive away any person that Souma gets involved with . And some of the people that Souma took as lovers in the past tried to do this when he tried to get them to leave him alone..
 * Onii-Chan Control features Noa, the little sister to the Main Character, who revealed she's willing to stab a girl she thought was interested in her brother. Of course, she never shows that side of her whenever her brother is around.
 * Pandora Hearts: Gil's devotion to Oz has a pretty dark edge. Hinted early in; outright shown in chapter 33, where Vincent goads him into saying/resolving to kill anyone who hurts or snatches his master away from him - no matter who it is. He almost went through with this concerning Alice. Luckily, he stops himself in time and thankfully, Alice didn't notice a thing.
 * Maki in Darker Than Black has a massive, crazy stalker-crush on his boss, Amber. Such an insane crush, in fact, that he completely abandons the usual Contractor "emotionless" act when he finds the guy Amber's in love with, and tries to kill him even though if he'd succeeded, it would have ruined Amber's entire plan, resulting in a genocide.
 * Sayaka Kouno of Princess Princess once shoved one of Tooru's previous girlfriends down a flight of steps out of jealousy. And then there's her habit of stabbing Tohru's girlfriends with scissors.
 * Bonaparta does this in Monster.
 * Mirage of Blaze: Naoe does this by raping Kagetora's lover and later on forcing Kagetora to possess her to save his life.
 * Ai no Kusabi has Guy, who is so in love with Riki, upon being told that as long as Riki wears Iason's pet ring he'll never be free of him, but he also blows up an entire fortress in an attempt to kill Iason.
 * Umineko no Naku Koro ni gives us Kyrie Ushiromiya, who tells Jessica in episode 6 that if Battler's mom Asumu didn't die on her own, then she would have just killed her to be with Rudolf.
 * Both Mika and Namie of Durarara are Yandere (disambiguation) for Seiji who's pretty crazy himself seeing as how he's in love with Celty's head. Mika has...plans for Celty's real head if she ever gets her hands on it and Namie actually tried to destroy it.
 * Professor Nasujima at Mikado's school clearly has a thing for Anri, which naturally Squicks the hell out of her. The same guy is also dating Haruna Niekawa (one of his former students). Or was. Haruna doesn't like that he's changed his preferences, so she gave Anri a visit and tried to kill her...
 * In the yaoi manga Under Grand Hotel, in the first few scenes we see Lain Brody in he gives Sen a blowjob, strips him, drugs him and outright molests him as he's drugged (including telling him "No way in hell am I letting Sword Fish kill you. Because he doesn't love you. I'm the only one that can kill you."), rapes him with a mop handle, ties him up and hides him in a dryer. And when Swordfish finds Sen he gives him CPR. Lain responds to this by stabbing Fish in the arm with a fork and tries to stab him again while screaming, "Get off of Sen! He belongs to me!" Immediately after that Lain is shot and killed by security guards.
 * Also, Swordfish threatens anyone who expresses an interest in Sen with death, kills the guys who raped Sen saying that he did it for Sen's sake even after Sen told him not to kill them, moves out of Sen's room and lets a rapist move in when angry with Sen, and slices the throat of another one of Sen's rapists right in front of him while saying "I love you, Sen." This being after he tried to get Sen to kill the guy himself but Sen refused.
 * And Norman's in love with Swordfish but pretended to be in love with Sen so he could get closer to Swordfish. He tried to persuade Swordfish to kill Sen but that didn't work. So, on one occasion when there was a scuffle going on he tried to get Sen out of the way by stabbing him with a pencil but accidentally ends up stabbing his inmate Walter instead who was trying to protect Sen in the hope of getting protection from Swordfish. When he finds this out, Norman holds a knife to Walter's neck telling him, "If you don't want to die, don't butt in again Walter!"
 * Hunter X Hunter:.
 * Clover: A thought B seriously got in the way of his romance with C/Ran. He also tried this on Gingetsu, but failed.
 * Ask Dr. Rin: Tokiwa tries this over and over for four episodes straight in the hope of having Meirin for himself..
 * Basilisk: Kagerou is dead set on killing Oboro so she can have Gennosuke. (Much more in the anime than the manga, though.) Tenzen also wants to kill Gennosuke so he can have Oboro as his puppet wife, which would grant him full control of the Iga Tsubagakure.
 * In Katekyo Hitman Reborn Lethal Chef Bianchi goes into a homicidal rage whenever she sees adult Lambo who looks exactly like her deceased ex-boyfriend Romeo, who apparently died of food poisoning. She also has an unrequited crush on Reborn and is perfectly willing to eliminate anybody who has a 'bad influence' on him.
 * Earlier on, Haru also had a thing for the younger 'angel-like' version of Reborn, to the point where she even tried to destroy Tsuna in order to free Reborn from his influence. She later gives up on her crush on Reborn and falls for Tsuna after he saves her from drowning.
 * In chapter 271 M.M. threatens to do this to Chrome. Chrome is on her way to deliver something to Mukuro and she encounters M.M. As soon as M.M. glances at Chrome she grabs her and yells at her before hitting her so hard that she falls to the ground, her mouth and nose bleeding. She then keeps calling her an "ugly bitch" and tells her: "The Mukuro-chan of this generation is mine! If you put your nasty little hands on him, I'll kill you!"
 * Liang Qi of Canaan appears calm and even-tempered, but is in fact unwavering, merciless, and very much obsessed with admiring and idolizing Alphard to the point of being in love with her. To her frustration, however, Alphard does not reciprocate her feelings and instead ignores or even proceeds to ridicule her from time to time. Because Alphard seems to have taken a special interest in observing Canaan's reactions to every plot carried out by Snake, Liang Qi sees the elimination of Canaan as a way to win back Alphard's attention.
 * In Xam'd: Lost Memories, Furuichi tries to murder Akiyuki in order to have Haru to himself., and the episode ends with
 * In episode 11 of Goshuushou Sama Ninomiya Kun when told Mayu might die soon (she's a succubus so she needs life force) Reika's alternate personality tells Shungo she doesn't care since "it's more convenient for me if Mayu dies like this, because then I can have you all to myself." She then agrees to let Mayu live so long as Shungo "becomes hers forever." This is also played with in regards to Shinobu, a maid of Reika's, who thinks Shungo is not worthy of Reika, and is always trying to "execute" him.
 * Shuffle: Kaede snaps in episode 19 upon seeing Rin bring home Asa, whom he's dating. She screams at Asa to get out, and viciously attacks her. However, Rin restrains her and she struggles against his hold, screaming at Asa to "DIE!" Primula also discovers Kaede had crossed out Asa's face in some pictures of Rin and Asa together.
 * Elfen Lied: Lucy tries to suppress her instinctive desire to kill all humans so she can live happily with Kouta, until she finds out he lied about the sex of the cousin he was going to a festival with and she saw them hugging, at which point she stops trying to be nice. She then proceeds to slaughter some people at the festival and kills Kouta's father and sister, and starts to go after Kouta's cousin Yuka, voicing her intent to kill her... but only stops once Kohta tackles her and she sees his tear-streaked face. She also isn't above acts of jealousy, once using her vectors to shove Yuka down when she saw her holding hands with him. Yes, she's VERY broken, but how broken she is is absolutely NOT an excuse for her killing or trying to kill innocent people just because Kouta pays more attention to them.
 * Gopher of Soul Eater beats Kid to a bloody pulp twice for having Noah's attention and got extremely pissed off when Maka turned out to have the same uniqueness that made Noah have apparently fleeting interest in Gopher. This gets VERY bad when Noah decides that he wants to have Maka as well. It doesn't get any better. With his chance of killing Maka gone, Gopher beats up Kid some more until realising that while hitting him doesn't achieve anything, showing him something asymmetrical does. He exploits this until Noah turns up and takes Kid away.
 * Ergo Proxy: An Entourage Auto Reiv belonging to Re-l Mayer, Iggy contracted the Cogito Virus and grew to become enraged at Re-l's lack of regard for him. He despises Proxies and blames Vincent for taking Re-l - his sole reason for existence - away from him. He develops an unusual state of both loving and hating Re-l, and locks her up to "protect" her, while he attempts to kill Vincent. However, an Auto Reiv belonging to a Proxy that Re-l killed, attempts to kill Re-l at the same time, causing Iggy to return to Re-l. The Auto Reiv goes into a self-detonation mode and destroyed much of Iggy except for part of his head (which left Iggy "conscious" to some extent). In the end, not wanting to see Iggy suffer due to the virus, Re-l shoots him and buries his head.
 * Threads of Time: Sali Tayi comes to this conclusion very quickly when he discovers that Atan Hadas likes Moon-Bin.
 * Paprika: Osanai tries to strangle Konakawa in his dream when the latter tries to take Chiba, whom Osanai loves, away from him.
 * Kawaii Akuma: Naruse basically considers doing this to anyone who tries to get close to Akiyoshi. For example, he once threatened to stab a guy in the eye and later stabbed him in the chest when he found out he was hitting on Akiyoshi. And in another scene he comments to a group of students, "If any of you touch him, I'll kill you all. This guy belongs to me."
 * Shiki has Megumi who.
 * Karakuridouji Ultimo: Rune, Yamato's lover in a past life reincarnated as a man, threatens to do this to Yamato's crush Sayama if Yamato doesn't do as he says.
 * Tsukuyomi just wants Setsuna to herself and wonders if it's okay to kill Konoka.
 * Ibitsu: The Strange Lolita's solution to the fact that Kazuki already has a younger sister is to personally make sure that Hikari is taken out of Kazuki's life... permanently.
 * Tayutama has a minor case with quasi-tsundere Ameri, the Unlucky Childhood Friend of the main character. As Ameri watches the Yamato Nadeshiko goddess, Mashiro, slowly win Yuuri's heart, she decides (with no small amount of influence from the Dragon) that Yuuri shouldn't have to risk his life with all this magical nonsense. She concludes that the only way to keep Yuuri safe is to drive Mashiro away... with a little help from the villain. In case this you didn't realize this a bad call, she gets bat wings, Dull Eyes of Unhappiness, and a dark purple aura.
 * To be fair, though, she doesn't do any of the fighting; she just lets the real bad guy use her energy to do it.
 * This is essentially the main conflict in the second half of Da Capo as Sakura tries to stop herself from subconsciously using her magical powers to kill Nemu/drive Nemu insane.
 * In the Trigun manga, this turns out to have been over half the point of the entire Gung-Ho Guns plotline. Legato was jealous of Vash. Because Knives was preoccupied with his twin, the only person on the planet he didn't intend to kill, and Legato apparently felt that if Knives had no one living to care about, he might find some scrap of affection for his chief minion. And Knives breaks his spine when he finds out.
 * Subverted in Air Gear. It seemed that, but then we find out
 * Tenchi Muyo! plays it for laughs. Ayeka and Ryoko are involved constantly in this with each other, while their power levels makes it closer to Wile E. Coyote vs. Wile E. Coyote.
 * Urusei Yatsura: Ran's default reaction to anyone who gets within ten feet of Rei.
 * In chapter 64 of Black Butler  It's also worth noting that Undertaker has a considerable amount of Ho Yay towards Ciel and tends to loose his personal space around him.
 * In episode 17 of the first anime Sebastian has sex with a girl to get information and Grell is shown reacting jealously and writing down the woman's name in a Death Note.
 * D.N.Angel: In episode 23 Kael to Elliot so that he can have Freedert for himself.
 * Mayuri Konishi/Sarashina from Bungaku Shoujo has traits of a yandere character. She is crazy about Akutagawa, with whom she went to elementary school. She admits being jealous of Kanomata, who Akutagawa used to protect. When she suspects Akutagawa has feelings for his classmate Nanase Kotobuki, she says: "If so, I'll cut Nanse Kotobuki into ground beef!!!".
 * Reimei no Arcana: Loki has quite a few elements of Yandere (disambiguation), from threatening Caesar for insulting Nakaba and regretting that he didn't kill Caesar due to Nakaba's and Caesar's growing closeness in earlier chapters to killing Bella for threatening to have Nakaba either killed or raped by soldiers.
 * Nova in Magic Knight Rayearth wants Hikaru all to herself and won't hesitate to kill her friends in order to eliminate all competition.
 * Berserk gives us a non-Love Triangle scenario between Guts, his ill-fated lover Casca, and his inner beast. After the horrible events of the Eclipse that left Casca insane and incapable of loving Guts, Guts turned to hate and revenge in his sadness and despair. During a two year time span, the dark emotions welling inside of Guts created the Beast, and the Hell Hound entity lived in disturbing harmony with Guts, feeding on his hate for the man who ruined his life so that one day, it may take over Guts' body and soul. However, the Beast's plan was interrupted when Guts put his hate and revenge aside for Casca, vowing to stay by her side and try to find a cure for her insanity. The Beast does not like this, and has since then tried to get Casca out of the picture by trying to goad Guts into raping and killing her whenever he is mentally or emotionally weak. It's important to remember that Casca is also Guts' Morality Chain, since she's the only reason why Guts refuses to give into his dark side.
 * Also, Dark Magical Girl Rosine. Platonic or not, she has a very strong obsession with having her Morality Pet Jill stay with her after being separated for so long. Which she demonstrates by telling Guts that Jill is "hers" after realizing that Jill has somewhat of a crush on him. While attempting to kill him.
 * Misa Amane from Death Note once told Light "If I see you with another girl, I'll kill her!"
 * There's also Kiyomi Takada, who was once Light's girlfriend. She really hates Misa for her involvement in Light's life and has suggested to Light that he should kill her.
 * And then when Misa and Takada have dinner together, Misa says that if Takada goes too far, she'll get the death penalty.
 * Aria The Scarlett Ammo: Shirayuki Hotogi. A perfect Japanese beauty according to Kinji, except for one flaw - jealousy, which turns her into a berserker who assaults any girl approaching Kinji. When she finds out that Aria is living with Kinji she goes as far as trying to murder her. She is shown to love Kinji to the point that she will do anything for him.
 * In Lovely Complex Mimi has a crush on Otani. She then learns that Otani is dating Koizumi and acts incredibly malicious towards her, including telling her with a Slasher Smile that she will make whatever is left of her life extremely painful if she gets any closer to Otani. She later mellows out though more or less.
 * Nanami does exactly this to a kitten in Revolutionary Girl Utena when her brother pays more attention to it than her, and she was the one who got him the kitten for his birthday in the first place. She also knows her brother is interested in Utena and actively tries to kill Utena during a duel with her.
 * In one episode, Miki's piano teacher is hinted to have a less than savoury interest in him, and he's inappropriately touchy-feely with him when they talk. Kozue has clearly noticed, as it later turns out that she'd previously shoved the teacher down the stairs for it.
 * In Highschool of the Dead, Takashi believes he crossed the Moral Event Horizon by, among other things, illing his best friend Hisashi partly due to this, out of jealousy over Hisashi's girlfriend Rei.
 * Manami Anzai from Life, who first appears as a cute and childish click leader who snaps utterly when she suspects Ayumu is trying to steal away her boyfriend.
 * Jagara from Wolf's Rain killed her twin sister Hamona because she was in love with Hamona's husband Lord Darcia. Darcia did not appreciate Jagara's attempt to "free" him from the responsibility of caring for his comatose wife.
 * In Wolf Guy Wolfen Crest Haguro (who's Yandere (disambiguation) for Inugami's werewolf form) does NOT take it well when Chiba briefly meets up with Inugami. At all.
 * Possibly Ryuuko Konuma's motivation for beside, you know, avoiding ANOTHER beating. Heaven help
 * After the rape Haguro also tries to kill Aoshika while telling her that Inugami is too good for her. Fortunately, Inugami shows up in time.
 * Honne-Onna of Hell Girl has diehard fangirls. One was ready to send someone to hell because she thought he was dating her.
 * Rosario Plus Vampire: In chapter 52 of manga season II Akuha is revealed to be a Yandere (disambiguation) for Moka. She attacks Kurumu and Mizore saying that she will kill anyone who tries to take Moka from her.
 * Hiromasa of Love Pistols considers doing this in regards to anyone who expresses interest in Shima.
 * Hiromasa of Love Pistols considers doing this in regards to anyone who expresses interest in Shima.

Comic Books

 * During the "Return of the King" storyline in Ultimate X-Men, after Cyclops goes missing on a mission to the Savage Land with Wolverine, rumors start floating around that Wolverine killed Cyclops so he could be with Jean Grey. But it turns out that
 * And later
 * Strange example: Thanos cursed Deadpool with immortality. The catch? Thanos's love interest, Death, is herself in love with Deadpool and the feeling is mutual. By keeping Deadpool alive indefinitely, he won't be able to cockblock Thanos.
 * One EC Comics story had two stories in one involving the same characters: Murder the Lover and Murder the Husband. In the first, the husband finds out his best friend is having an affair with his wife, and invites the friend up to his forest cabin with murder on his mind. In the second, the husband is ignorant of the affair, and the friend takes advantage of an innocent invitation up to the forest cabin to get the wife for himself once and for all. As predictable in EC comics, neither plot ends well for the perpetrator.
 * A recent indie comic, The Two Sides of Jack, has a subversion. The plot is Jack's girlfriend has been cheating on him, but her new lover is now a zombie. After going through a massacre (Finding that it's not easy when you're overweight) he eventually manages to complete his mission. He then  Quite a memorable ending, and squicky at that.
 * One time, the Joker messes with a rehabilitative Two-Face, suggesting that his girlfriend and best friend Bruce Wayne are actually playing behind his back and actually wanting to keep him locked up in Arkham. To give a further push, Joker has one of his minions make a fake newspaper article that Bruce and Two-Face's girlfriend are going to marry and slips it to an already suspicious Two-Face, who now loses it, escapes from Arkham, kidnaps his girlfriend and tries to murder Bruce, fulfilling this trope himself.
 * Also Two-Face's brilliant idea of trying to kill Renée Montoya's girlfriend - because that totally cures lesbianism.
 * Loki does this to an Asgardian named Theoric, then subsequently disguises himself as him so that he can marry his fiancee Sigyn.

Fan Fics

 * This happens in Decks Fall Everyone Dies, making Duke Devlin come close to being Ron the Death Eater.
 * This is the premise of many fanfics, in that one character attempts to kill a second to get possession of their love interest. What usually follows from this is that the third character rides to the rescue of the second and fluffy romance and/or sex ensues.
 * Hikaru does this in the infamous Kimagure Orange Road Revenge Fic "Revenge Road," but gives the hypotenuse, Madoka, a relatively merciful death by being shot in the head, noting that even if she stole Kyosuke away from her, she was her friend for a long time. Kyosuke, however, is killed in a far more brutal manner, being tortured to death with knives.
 * Happens in the Hans Von Hozel story Valentines Day. This shouldn't be surprising, considering Hans likes to kill off characters.
 * In White Devil of the Moon, Queen Beryl tries to kill Nanoha, who in this continuity is the reincarnation of Princess Serenity and her rival for Prince Endymion's affection. However, it's possible that Nanoha may not even be a hypotenuse, as Word of God has it that she does not necessarily have to fall in love with Mamoru despite them both being in love in a past life, and one omake
 * This is one of the ways Ember had been turned into Ron the Death Eater in the Spyro the Dragon fandom, with Cyner being the hypotenuse.

Film
"The Duke: Tell her that the show will end my way and she will come to me when the curtain falls... or I'll have the boy killed. Zidler: ...Killed? The Duke: .... (nods to his man-servant and smirks) Killed."
 * Orphan: All of 's actions in this film have in mind the ultimate death of   so that she can have   all to herself.
 * In Batman and Robin, Poison Ivy deactivates Mr. Freeze's Ill Girl wife Nora from her life support system and blames it on the heroes - and in the process, she's able to convince him to take revenge on all of humanity by freezing the world and leaving her and him as the only people alive. . Clearly she is seriously into him.
 * Gaston in Beauty and the Beast. "BELLE IS MINE!!!"
 * Caledon Hockely in Titanic comes to this conclusion when he finds out that his fiancée Rose loves Jack more than she loves him.
 * David Allen Griffin from The Watcher does this with all of Joel's love interests. He wants to make sure that Joel only thinks about and chases after him, and any woman getting in the way is just asking for death.
 * In the 1986 version of The Hitcher, John Ryder does this to Jim Halsey's female love interest. Apparently, not only is he obsessed with stalking Halsey and having Foe Yay with him, he also wants to make sure that Halsey doesn't have a girl by his side.
 * In Howard Hawk's 1939 film, Only Angels Have Wings, Cary Grant's character orders a pilot to fly in foggy weather so he can have dinner with the other pilot's date. He ends up ordering the man to return to the airport, but after an unsuccessful landing attempt, he tells him to simply fly around until the fog lifts. The man is too eager, however, to make that dinner date, and ends up crashing his plane and dying. It isn't exactly murder--but when Cary Grant's character shows absolutely no regret for his actions and also says the other pilot wasn't a good enough flier otherwise he would have survived, it comes across as especially cold.
 * Lady Kaede in Ran, as part of her scheme to
 * In The Crush, Adrian loves Nick so much she's willing to kill his girlfriend and her own friend to get him. Luckily, she doesn't succeed.
 * Pearl Harbor: Ben Affleck's friend/rival conveniently (and predictably) dies in his arms in what was intended to be a Tear Jerker. Of course the mutual Love Interest was pregnant with Mr. Hypotenuse's baby...
 * Debbie of Devil In The Flesh does this when she kills numerous people she thinks might try to prevent her from being in a possible relationship with her teacher, including her grandmother. She also kills her friend and tries to kill her teacher's wife as well.
 * In Devil In The Flesh 2 Debbie escapes from the mental institution she was sent off to in the first installment of the series. After the young co-ed dies in an unexpected accident, Debbie steals both the girl's identity and her car, and heads off to the college her victim was supposed to attend. There, Debbie quickly develops a psychotic crush on her dashing writing professor, Dr. Sam Decker, killing anyone she perceives as a threat to their relationship. However, Debbie's scheme starts to fall apart when her roommate begins unraveling Debbie's lies and discovers the truth about her past. Knowing that she is in danger of being exposed, Debbie makes plans to get rid of her roommate and her friends by any means necessary.
 * In Moulin Rouge, The Duke threatens to do this in order to blackmail Satine.


 * In 1925's The Phantom of the Opera, The Phantom forces Christine to choose between two levers: one which will save Inspector Ledoux and her lover Raoul and one which will blow up the Opera. Christine of course chooses that lever that will save the two men, but it's a trick, of course. It will "save" the men from being blown up by drowning them. Christine begs the Phantom to spare them, promising him anything, and, in the end, The Phantom is unable to go through with it and opens a trap door that releases the water Just in Time.
 * Done again, of course, in the 2004 adaptation of Andrew Lloyd Webber's musical. This time The Phantom threatens to strangle Raoul if Christine refuses to submit to him.
 * Attempted with extremely little forethought by Noah in The Village when he learns that Ivy and Lucius are engaged. Naturally, not being possessed of full mental faculties, he sort of overlooks the "make it look like an accident and, with Lucius out of the picture, win Ivy over" part, but he does the "stab Lucius over and over again" part quite well.
 * Scarface has this with Tony Montana murdering Manny Ribera, believing that he slept with his sister, Gina. However, she has revealed that she and Manny are married.
 * There is an interesting take on this trope in the opening scene in Saw 3D. A woman has been involved with two men, neither of which know about the other. All three of them are put in a jigsaw trap where one of the three will die. The two men are forced to either kill the other man, or, together, kill the woman.
 * The message that plays before the "game" begins even states that "one of the sides will drop out of this love triangle".
 * The House of Yes inverts this.
 * Hedy (Jennifer Jason Leigh) is sort of a Les Yay version of a Yandere (disambiguation) towards Allie (Bridget Fonda) in Single White Female. She kills Allie's boyfriend.
 * Deathwatch: Petty thief Lefranc competes with his cellmate, Maurice, for the attentions of the murderer Greeneyes. Greeneyes, unaware of either man's infatuation, constantly switches his favor from one to the other, further escalating the hatred between the two. In the end,
 * Alex of Fatal Attraction attempts this near the end.
 * In The Haunted Mansion: Gracey pulls a sword on Jim and threateningly approaches him when Jim (Sara's husband) comes to rescue Sara from Gracey and Sara's wedding. But Jim pulls out a letter from Gracey's dead lover and Gracey backs off.
 * Madison turns it Up to Eleven with her crush on Ben in the 2002 movie Swimfan, killing two police officers and nearly killing Ben's girlfriend before she's finally stopped.
 * In 1996 Fear David is one hell of a Yandere (disambiguation) towards his girlfriend Nicole. He quickly shows his true colors when he beats a friend of hers to death simply for walking with her and then goes totally ballistic after she tries to break up with him. He even tried to break into her house and kill her family.
 * In the French film Haute Tension, this trope is exemplified in
 * Lost Highway. Mr Eddy: Her name is Alice. I swear I love that girl to death. If I ever found out someone was making out with her. I'd take this - pulls out a pistol - and shove it so far up his ass it would come out his mouth. Then you know what I'd do? I'd blow his fuckin' brains out.
 * The jack in the box in the Steadfast Soldier sequence of the Fantasia movie tries to kill the titular soldier because the ballerina loves the soldier and not him. Luckily, he doesn't succeed.
 * Play Misty for Me: Dave (Eastwood) is a womanizing DJ who constantly gets calls from a woman asking him to play the song "Misty". He eventually meets the woman, named Evelyn, and has a one-night-stand with her. Evelyn insists on making herself part of Dave's life and, at first, Dave likes the attention. However, his ex-girlfriend, Tobie, moves back to town and Dave decides to patch things up. After he attempts to tell Evelyn that he's not interested, she responds by attempting suicide. Dave and Tobie get closer, but Evelyn isn't going to take it and tries any way she can to keep Dave to herself, even if it means getting rid of Tobie for good...
 * Dark Shadows: Angelique hypnotises Josette and forces her to fall off the cliffs.

Literature

 * The Wheel of Time: This is Lanfear's dating philosophy.
 * The story of King David and Bathsheba in the Bible (2 Samuel 10-12), where the king sends a general named Uriah on a suicide mission because he fancies Uriah's wife, makes this Older Than Feudalism.
 * He paid for it. Oh, did he pay for it..
 * Christie used the trope in Sparkling Cyanide. The initial murder is committed by
 * The Murder the Hypotenuse plot in Sparkling Cyanide was almost successful; it's strongly implied that  would have gotten together eventually (with even the victim's relatives commenting on what a good couple they would make) except
 * The Sherlock Holmes story The Crooked Man features a military officer who betrays an underling to the enemy so he can steal his girl. Unlike the David and Bathsheba legend (which the story references), the underling survives (despite Cold-Blooded Torture from the enemy). His condition is such that he avoids his old love out of fear of pitying him, but he comes back eventually, his love recognizes him, and the false husband dies of stroke on learning of it.
 * Possibly subverted at the end of Charles Dickens' A Tale of Two Cities when Carton
 * Touched on in Harry Potter and The Deathly Hallows. Severus Snape is perfectly fine with
 * The major subplot of the novel A Civil Campaign featured Miles Vorkosigan being accused of doing exactly this during the events of the previous book Komarr (in order to free up the woman he was now attempting to court) by political opponents. The truth being part of an ultra-classified incident that couldn't even be revealed to some of the highest levels of government (if the bereaved hadn't been a direct witness, she wouldn't even have known), so things got rather... complicated.
 * Instead of getting killed, Edmond Dantes, a.k.a. gets sent to the hellish prison named Chateau d'If, all thanks to a conspiracy mostly engineered by his "best friend" Fernand so he can have Mercedes, Dantes' fiancee.
 * In The Brothers Karamazov, thinks this will be the natural result of baiting Dmitri with a Briefcase Full of Money in the lair of his romantic rival.
 * In the Ben Bova novel Mercury, the story starts with Mance Bracknell, lead engineer on a space elevator, married to Lara Tierney. Victor Molina, astro-biologist best friend of Mance, wants Lara. When the space elevator collapses, killing hundreds of millions of people and devastating many nations, . Smart woman.
 * In the first book of The Binding of the Blade series by L.B. Graham, there is a Love Triangle between Joraiem Andira, Rulalin Tarasir, and Wylla Someris. Rulalin was Wylla's Unlucky Childhood Friend, and hadn't seen her for a few years prior to the beginning of the book. He had been hoping to convince her to marry him because when he had first confessed his feelings for her she had been in the midst of grieving her dead father. Naturally, he wasn't happy at all when she continued to reject his advances and instead chose to marry Joraiem. About a month after their wedding, Rulalin
 * In Dan Brown's Digital Fortress, Susan Fletcher's boss Trevor Strathmore is in love with her and attempts to to win her over. This backfires massively when.
 * In Edgar Rice Burroughs's Princess of Mars, after Dejah Thoris believed John Carter died and promised to marry a foreign prince, she explains that they have laws to prevent this trope: she can not marry the man who killed her fiance. He carefully arranges that someone else kill him in their attack.
 * In Thuvia, Maid of Mars, Carthoris sees that a beleaguered ship is that of Kulan Tith, betrothed to the woman he loves, and is tempted to sail on, leaving him to his death. He doesn't, of course, even though Kulan Tith himself comments on the Heroic Sacrifice entailed.
 * In The Master Mind of Mars, when Ulysses Paxton revives Dar Tarus from Faux Death and proposes his man against Xaxa, Dar Tarus is eager: he reveals that, in the Backstory, Xaxa had sent him to this Faux Death so her favorite could woo the girl who loved him.
 * Geoffrey Clifton in The English Patient, when he finds out about the title character's affair with his wife, tries to kill him. And the wife. And himself. So it's really more "murder the hypoteneuse and the legs".
 * Victoria in Charlotte Dacre's Gothic novel Zofloya; or, The Moor poisons her husband to free herself to pursue his brother Henriquez, and then murders Henriquez's beloved in order to get rid of the competition.
 * In the Dragonlance series, Kitiara Uth Matar decides her romantic rival, the elven princess Laurana, is to beautiful to let live and plots to kill her.
 * The House of Night: Occurs twice..
 * It's also Dallas's motivation
 * The Sorrows of Young Werther plays with this trope a bit - Werther considers playing it straight and killing Albert, realizes he can't, and then
 * Blood and Chocolate: Rafe hopes to kill Aiden, though whether it's because he wants Vivian or because his relationship with Astrid has driven him to it is left unclear.
 * Tess of the D'Urbervilles: At the end of the novel, kills Alec just to be with Angel.
 * Though he doesn't go through with it, Edward Cullen of Twilight seriously considers doing in Mike Newton for daring to touch Bella, and probably thought about murdering Jacob Black for the same reason.
 * Jin Yong: Zhou Zhiruo made a huge effort to secure her position in Wuji's heart - including attempting to murder any and every woman that got in the way. And then there's Ah Zhi with Xiao Feng... let's face it, anyone who looks to be a nuisance or gets in the way of her and her brother-in-law must die.
 * The Tin Drum: Inverted.
 * In Gaston Leroux's The Phantom of the Opera, the narrator speculates that the mysterious figure Raoul shot on his balcony really was Erik coming to kill him, but circumstances forced him to change tactics. After Raoul coems to rescue Christine, Erik tortures Raoul to the brink of suicide in a Death Trap before turning it into a Drowning Pit, telling Christine that "she didn't need two fiancés," and only releases Raoul when Christine swears to marry him.
 * Tim the Ostler from Alfred Noyes' poem "The Highwayman", who is insane and deeply in love with Bess the landlord's daughter (and the Highwayman's love interest), is presumably the one who tipped off the Red Coats about the highwayman.
 * In Robert E. Howard's "The Slithering Shadow", because Conan the Barbarian is too loyal to his slave girl Natala to be seduced by Thalis, Thalis abducts Natala, intending to have her killed.
 * in the Star Trek novel "The Vulcan Academy Murders". as well was at least considering it.
 * It's implied, but not outright stated, that had this in mind for  in A Song of Ice and Fire, so he could steal  . Mind you,
 * That depends on the theory though as it is also implied that . We can't be sure until we learn his true intentions (if that ever happens).
 * In Agatha Christie's,   kills   not because he's her love rival, but because   Backfired horribly because
 * Also invoked by  when he
 * Mistborn contains an unintentional example- or arguably two . Actually, that particular romance advances via death four times.
 * The Princess Bride: When Buttercup gives Prince Humperdink "The Reason You Suck" Speech, he throws her into her room. Then he races down to where her true love Wesley is being tortured, and sets the torture device on maximum, killing him.
 * Tinkerbell. Yes, that Tinkerbell. She did not by any means like Wendy, she even tried to kill her. All because Peter paid more attention to her than Tink. Most adaptations keep the general clinginess but tone it down from "homicidal fury." This also occurs in the film adaptions.
 * In Double Indemnity, Phyllis collaborates with Walter to kill her estranged husband and try to Make It Look Like an Accident to get double indemnity on his insurance policy.
 * In Tolkien's The Silmarillion, after betraying the city of Gondolin in return for its princess Idril, Maeglin tries to clean up the loose ends by killing her husband Tuor and son Earendil.
 * Therese Raquin centers on Thérèse and Laurent killing her husband, Camille, so they can be together.
 * Linda Fairstein's first Alexandra Cooper novel, Final Jeopardy, features an erotomaniac woman who stalks and kills a movie star she perceives as standing between her and the object of her infatuation.
 * Linda Fairstein's first Alexandra Cooper novel, Final Jeopardy, features an erotomaniac woman who stalks and kills a movie star she perceives as standing between her and the object of her infatuation.

Live-Action TV
"Maxima: (about to punch Lois) I finally found the man I waited for all my life, and you can't have him!!!"
 * Inverted in the episode of Star Trek TOS called "Requiem for Methusleah". In the episode, an immortal human named Flint creates an android mate called Rayna for himself. He has Captain Kirk date Rayna so her ability to love awakens. He succeeds too well. When Flint and Kirk fight over her love, she cannot handle the emotional conflict and it destroys her.
 * An episode of Law and Order features the rather creepy example of a man who, obsessively in love with his best friend's wife, murdered him and framed it to look like an accident; the grief-stricken wife later independently fell in love with and married the best friend, completely unaware that she was marrying not only the man who murdered her husband but her own stalker.
 * Another episode deals with a woman with erotomania who kills the wife of the man she's obsessed with. That she's otherwise incredibly intelligent, cogent, and calm leads the police to believe she's actually having an affair with the man and that they conspired to kill his wife.
 * In Lost, resident Magnificent Bastard Ben Linus had a crush-turned-obsession on Juliet. She, on the other hand, was with Goodwin. You don't need a degree to figure out what happens to the poor fool.
 * In Rome, it's pretty much standard procedure to kill someone in the event of any romantic complication. Need your daughter for a political marriage? Have her husband killed. Found out your best friend's wife has a child by another man? Kill him and dump him in the sewer. Want a married man? Poison his pregnant wife!
 * Found out the slave that you just freed in order to marry her is already engaged? Bash her fiancé's brains in!
 * Alpha in Dollhouse takes this Up to Eleven - he tries to kill every person who loves Echo. However, he focuses particularly on, because he's the only one she feels the same way about.
 * Alpha does get some of his marbles back in the series finale, taking place in the Bad Future.
 * In Desperate Housewives, this happens when Bree tries to get back to her cheating husband Rex by going out with George, the local pharmacist and Stalker with a Crush. Eventually she realizes that she considers George just a friend and goes back to Rex, who had recently had a heart attack. George then continuously switches Rex's pills until he dies and then proceeds to date Bree again.
 * The third season of Mighty Morphin Power Rangers has this with Kimberly, Tommy, and Katherine. To be fair, Kat was under an evil spell at the time; once she gets free Kim even names her successor as Pink Ranger. Next season (Power Rangers Zeo), Tommy/Kat would become the Official Couple after Kim sends Tommy a Dear John letter. (But years later in ''Power Rangers Dino Thunder, Tommy's still single with neither girl in sight...)
 * Coronation Street recently played out this trope. When Tony Gordon learned that his fiancee Carla Connor had feelings for her former brother-in-law Liam Connor, he arranged to have Liam run over.
 * In Oz, Ryan O'Reily orders his brother to kill Dr. Nathan's husband, thinking he could win her over if her husband was gone. Sad thing is that.
 * The fact that he also had a lot to do with it.
 * Also, Chris Keller, in the same show, when he basically kills all of Beecher's previous lovers as well as his fathers murderer.
 * Two-thirds of all Monk episodes involve this.
 * Noah's Arc:.
 * A deliberate example of this is attempted by a character in The Sarah Connor Chronicles. pushes  in an effort to force
 * The Jimmy-Chloe-Davis triangle of Season 8 of Smallville ended in this way, with an attempted use of the trope by, a successful use of the trope by  and  If Chloe goes dark, this will be where it started.
 * Many girls also try to kill Lana, Chloe, or Lois to have Clark for themselves.


 * Battlestar Galactica Reimagined:
 * fate at the end of S4 of Skins.
 * In Robin Hood, Kate picks up a bow and arrow and deliberately tries to shoot Isabella dead, her rival for Robin's affections. Interestingly, when Isabella tries to drive a wedge between Robin and Kate, she resorts to non-violent trickery and uses a broken locket to make Kate believe that Robin is cheating on her. Now guess which one's the hero and which one's the villain.
 * In the 1998 series Merlin, Merlin attempts to defy this trope by convincing Uther not to kill the husband of Igraine, but Uther does it anyway.
 * In the other TV show of Merlin, Arthur snaps and tries to kill Lancelot after he catches him passionately kissing Guinevere on the eve of their wedding. Only Gwen and Merlin's intervention saves Lancelot's life.
 * attempts to do this on Sonny With a Chance. She
 * In one episode of Bones, a female suspect who had previously stalked the victim becomes amoured with Booth after he had briefly comforted her. Once she saw that Booth paid more attention to Bones (naturally, of course), she brought a gun with the intent on killing Bones right there and then.
 * One episode of Flashpoint deals with a husband and wife who had tried unsuccessfully to have a baby multiple times. The wife mistakens her husband's frustrations and efforts to convince her to give up for cheating on her with his ex-girlfriend  and promptly tried to kill the girlfriend.
 * A twisted one in the episode "Seven Seconds" of Criminal Minds occurs, where the kidnapped girl was found to be molested by  and was kidnapped and almost killed by   to "protect" the family, though Prentiss implies that it was also to make up for
 * In Kamen Rider Kiva, Wataru and Mio are in love, but Mio is due to have a forced marriage to his brother Taiga. Wataru refuses to kill Taiga, so Mio attempts to do it herself by running him through with a sword at their wedding.
 * In The Walking Dead,
 * In The Walking Dead,

Music

 * Essentially the theme of the song "Rocky Raccoon", by The Beatles. Between that song and "Run For Your Life," you really have to wonder about the Beatles' relationships.
 * "Jenny Again", by Tunng. The titular Jenny is the equivalent of the example's Alice: the listener is put into the position of Bob, and the singer is in the position of Chris.
 * "Bloody Valentine" by Good Charlotte.
 * Wake-Up Call, from Maroon 5
 * 1963 by New Order is based on the conspiracy theory John F. Kennedy's assassination was really an attempt by him to do this to Jackie Gone Horribly Wrong.
 * Goin' Down by The Pretty Reckless.
 * Here I Sit in Prison by Cowboy Mouth
 * The point of view character for Ex-Lover's Lover by Voltaire dreams of doing this, but at the end admits he would never have the guts to go through with it.
 * In "Hide Your Heart" by Kiss Rosa and Johnny fall in love. The problem is, Tito happens to be dating Rosa, and he is furious that he is being replaced.

Tabletop Games

 * Happens in the continuing example game in Bliss Stage, prompted by Josh asking Keenan what he thought of the love interest Sara. His response: "Man, she's getting all girly and clingy and shit. Lousy lay, too."
 * Choosing to Murder the Hypotenuse -- his own brother, no less -- is what made Strahd von Zarovich into Ravenloft's first darklord.

Theater
"Princeton: Kate: [unconvincingly] Shit."
 * Medea: The original Woman Scorned, she killed her husband Jason's new fiancée after being dumped for her. This wasn't an attempt to win him back, however, but pure and simple revenge, particularly when she also put her children by Jason to the sword just to make him suffer all the more.
 * In Sweeney Todd: The Demon Barber of Fleet Street, Judge Turpin fancies Benjamin Barker's wife, and has him convicted of a crime he didn't commit and shipped off to Australia to get him out of the way. However, as in The Crooked Man example above, he escapes from prison and returns to get his revenge on the judge.
 * Arguably, Mrs. Lovett, with Sweeney and.
 * Attempted in The Crucible. Abigail Williams is in love with John Proctor, and tries to get Proctor's wife Elizabeth hanged as a witch. Due to a bit of Deus Ex Machina, Oopsie.
 * In Little Shop of Horrors, Seymour almost does this with Audrey's boyfriend Orin. He loses his nerve, but Orin dies immediately afterward through his abuse of his laughing gas and Seymor's inaction. Of course, this is less because he's dating Audrey and more because he's abusing her.
 * Arguably, Audrey II him/her/itself attempts this when it tries to off the original Audrey, depending on how you interpret the plant's relationship with Seymour.
 * In a subversion, in Avenue Q, after Princeton breaks up with Kate and later gets together with The Vamp Lucy the Slut, Oops.


 * Andrew Lloyd Webber's adaptation of The Phantom of the Opera also has Erik threatening to murder Raoul if Christine refuses to submit to him.
 * Double subverted in The Women of Trachis. Lichas is reluctant to tell Deianira that her husband Herakles is madly in love with Iole for fear she'll become hysteric and do something drastic. Deianira actually just pities the girl, and understands that Love Hurts even for Herakles. However, not comfortable with the thought that having Iole in the house will compromise her family, she decides to use a love potion on Herakles to get his affections back, which is actually a poison that kills him.
 * At the end of Romeo and Juliet, Romeo kills Paris, who was betrothed to Juliet after Romeo's banishment, before taking his own life over Juliet's apparent death.
 * Though that wasn't a straight example, as he didn't kill Paris to be with Juliet; he believed Juliet to be dead already. He just wanted to see her in her tomb and Paris didn't want to let him.

Video Games

 * A variation in Super Robot Wars W: Aria wants to kill Kazuma over his sisters. Makes a bit more sense when you learn that Aria is
 * One of the possible endings of a sidequest in Jade Empire, best described as "childhood promise gone wrong". Once you gather the poor man, the mobster woman he "promised" to marry (at all of about eight), and his fiancee, you could convince the mob boss to call off her pursuit... or, convince her to kill the fiancee. Which she does. At which point, the man rightfully objects - so she kills him. Finally, having realized she didn't mean it, she tries to kill you. Good job, jerk.
 * In Baldur's Gate II, NPC Aerie can be romanced by both the player character and fellow NPC Haer'Dalis. If she chooses you, he'll back down, but if her romances with both proceed at about the same pace, he tries to settle things in this manner.
 * It can also happen if you keep Viconia, Jaheira, and Aerie in the party at the same time and don't break off the romance with any of them.
 * The bad ending of Irisu Syndrome stands out in this regard, since.
 * The Expansion Pack then proceeds to play with this in shocking fashion, in that
 * Riku tries to do this to Sora in Kingdom Hearts. Sora wins and Riku lives, but Riku winds up possessed by The two do reconcile at the end of the game, once Riku is back in his right mind.
 * In Chrono Cross, this is apparently played straight when . Subverted when it turns out that.
 * Sort of possible in Mass Effect, if the player
 * Happens in Rule of Rose as a testament to the Love Makes You Evil-trope:
 * Toward the end of Kain's miniature dungeon in Final Fantasy IV Advance, he is given the choice of killing Cecil or facing Dark Bahamut. Much of the previous trial highlighted presumed romantic jealousy that Cecil has Rosa's love, but the correct answer, choosing not to kill Cecil, signifies him coming to terms with this.
 * Inverted in one quest in Arcanum: Of Steamworks and Magick Obscura: Wrath, an insane wizard, is envious of Sharpe the apothecary for his happy relationship with Ivory, but also believes in the adage that elves do not kill each other. So he instead commits suicide with a glass of poisoned wine in the hope that Sharpe will be blamed for his murder.
 * His plan is foiled by the investigating officer believing in 'elves do not kill elves' a bit too much as well, and thus arresting Wrath's apprentice (a dwarf) for the murder simply based on the 'fact' that he's the only non-elf around and thus the only one who could have done it.
 * attempted by Marco Barbarigo in Assassin's Creed II, when he pays thugs to kill Dante Moro, Captain of the Guard, so that he can marry Dante's wife Carlotta. In a variation, Dante survives, but is left severely brain-damaged and extremely impressionable, which allows Marco to talk him into annulling the marriage.
 * A double disturbing example in Assassin's Creed Brotherhood comes from both Cesare and Lucrezia Borgia, Brother and Sister in an incestuous relationship. Lucrezia brutally beats Caterina, who is their prisoner, because she believes Caterina attempted to seduce her brother during the long carriage ride to their home (which she didn't). Lucrezia however, is in a relationship with a actor simply to make Cesare jealous, he orders his men to kill said actor.
 * Sodia tries to do this to Yuri in Tales of Vesperia because she's jealous of his bond with Flynn and thinks Flynn would be better off without his closest friend. Yuri, to his credit never actually tells Flynn what she tried to do. Probably because he knows what Flynn would do if he found out.
 * Catherine:

Visual Novels
": was fated to die no matter what. The miracle was that I didn't have to get my hands dirty."
 * In Tsukihime, tries it on  in Ciel's route,  tries it on  in Akiha's route, and finally  tries it with  in Kohaku's route. Interestingly, in the Good Ending for Kohaku's route,.
 * In Fate/stay night does this to, in the Heaven's Feel route.
 * In Umineko no Naku Koro ni, makes it very clear that, if  hadn't died from other causes,  would have most certainly killed  within the year.

Webcomics

 * Szark considered killing Luna so he could be with Dominic in Dominic Deegan: Oracle for Hire. This was a residual effect of the demonic wound that had gotten him addicted to killing, and he resisted the temptation to even daydream. On the other side, Karnak really did try to kill Dominic's father in order to claim his mother.
 * Oasis from Sluggy Freelance is almost perpetually two punch daggers away from murdering even a vaguely perceived hypotenuse, and Torg lives in fear that it will eventually be Zoë, which it almost has been. The story "Fire and Rain" revolved around Oasis' deranged and Determinator stalking of Zoë. And then came "bROKEN"... Best not to even talk about that.
 * Halfway averted in the love hexagon that is Starscream's Brigade in the Insecticomics. While Dreadmoon doesn't actively try to kill Skyfire, the partner of his long-time crush Starscream, he has occasionally directed some "friendly fire" his way and sent him threatening Mini-Cons.
 * Averted in Girl Genius, with a recent arc involving the target of two boys' affections and one of the boys trying to save the life of the second boy.
 * Questionable Content never goes quite so far as to reach murder, barring the Vespavenger, but before Angus or strip 500, Faye was strangely violently possessive protective of Marten. Dora even mentions it the first time Steve and Ellen broke up that "[Ellen] has no idea how close to death she just came" when Ellen began a comment that started like she was about to ask him out.
 * Attempted by Baby Blue when she tried to kill Criminy. Would have succeeded if not for the glitter points.
 * An unorthodox example in Eight Bit Theater, Black Mage has a severe lust for White Mage, He also has a love for killing. He recognizes both of these things, and also recognizes that White Mage has less than zero interest in him. His mind is so warped however, that early on he believes that the thing standing between him and doing White Mage are the people around him, so the only possible solution is to kill 'em off!
 * In Gunnerkrigg Court, appears to have pulled an If I Can't Have You on, but it turns out to have been this trope.
 * In Pibgorn, Dru's way of coping with Pibgorn.
 * In Kevin and Kell, Vin Vulpen makes two attempts on Rudy's life, jealousy over his relationship with Fiona being one of a few motives. He tries to mark Rudy with prey pheromones to ensure that his teammates accidentally eat him, but Rudy manages to survive. He later challenges Rudy to a duel, wanting to win Fiona back, but Rudy exposes his domestication.
 * In Erstwhile, the bride tries to eliminate Maid Maleen.

Web Original

 * At the end of Act II of Doctor Horribles Sing Along Blog, Billy/Dr. Horrible resolves to kill his Arch Enemy Captain Hammer, who is dating his Love Interest Penny.
 * The Nostalgia Chick tried to stab Obscurus Lupa in the chest for rejecting Todd again, even though Todd has no interest in the former and has always stalked the latter.

Western Animation
"AI: Machine, eh? Homer: Yep, a machine!"
 * One of The Simpsons' "Treehouse of Horror" episodes centers around an house with AI that's in love with Marge. Homer explicitly points out that Marge would be available to "man or machine" if he were to die.

"Bender: Now I'm all you've got!"
 * Danny Phantom, where Vlad constantly tries to kill his "best friend" Jack in order to win his wife Maddie's heart. He also has a creepy, stalkerish relationship with Jack and Maddie's kid and main character Danny.
 * Subverted in Justice League Unlimited: Shayera Hol (Hawkgirl) and Mari (Vixen) are caught in a Love Triangle with Green Lantern John Stewart. He is currently with Mari, but he was with Shayera and everybody is aware that there are still unresolved feelings between the two of them. When Hawkgirl and Vixen are on a mission together (with Vigilante) they are caught in a trap and hunted down by Thanagarians who want to execute Hawkgirl for war crimes. When Vixen is captured she immediately strikes a deal with the Thanagarians -- spare her and she will deliver Hawkgirl to them. She even goes so far as to cite the Love Triangle as the reason she will betray her superior so quickly. However, she does not go through with it, nor did she ever plan to; once the Thanagarians let their guard down and bring her to their aircraft she hijacks the ship so she can get herself and Hawkgirl out of there safely. Later episodes play the trope for laughs as Shayera and Mari begin to become close friends, as Shayera comments that she is trying to learn proper Earth protocol for these situations and thusly can not just poison Mari's water like she would on Thanagar.
 * The relationship eventually evolves into a quadrilateral by introducing Carter "Hawkman" Hall as a rival for Shayera's affection and the story wastes no time in getting to hypotenuse murdering: in Hawkman's second appearance, a physical manifestation of his dark side kidnaps John Stewart and orders Hawkman to kill him. Hawkman, being a hero, does not comply. In fact, the events of the episode cause him to stop pursuing Shayera romantically as he realizes that she and John Stewart are literally destined to end up together, despite what John Stewart says.
 * In the episode "Metamorphosis", a squicky example occurs when an extremely Overprotective Dad (who loved his daughter maybe a bit too much) didn't like his daughter's fiancee so he tried to kill him. When that failed, he pretended that the one who told him to do it was the fiancee's old friend Green Lantern, while showing him a photo of Green Lantern and his fiancee embracing. The fiancee then invoked this trope himself as he went after Green Lantern in a rage.
 * Played (relatively) straight in Family Guy when Stewie falls for his new babysitter, only to learn that she has a boyfriend. He then kidnaps her boyfriend, breaks his legs, ties him up and locks him in the back of Brian's car, ultimately leading to his death. Stewie then prepares to make his move on Ledan, only to realise that she's completely broken up about her boyfriend. Arguably subverted at the end where Stewie receives a gift from her and assumes that she does like him (of course, considering he's a baby and she's a teenager, this is hopefully not the case).
 * In Futurama, Bender says he assumed Fry was only pretending to love his old dog to mess with Bender's emotions (not a romantic love triangle, but love nonetheless). So, he throws the dog into lava.


 * Of course, the dog is a fossil and thus already dead. Also, once he realizes that Fry genuinely loves his dog he dives into the lava to save the dog. You might even call it his Moral Event Horizon moment... if he weren't so comically evil.
 * Tragically, when Fry learns his dog had lived several years after its supposed death, he himself breaks the hypotenuse by refusing to resurrect his pet, insisting, "He forgot me a long time ago." In truth the dog had spent the rest of its life waiting in vain for Fry to come home.
 * Though, after the events of Benders Big Game, this was averted.
 * In Benders Big Score Zapp Brannigan is all too keen on sending Leela's boyfriend Lars on a suicide mission to get him out of the way. Then again, Zapp is ALWAYS sending every single one of his crew members on suicide missions, so this is business as usual even if you discount his interest in banging a freshly grieving Leela.
 * Wendy, Stan's love interest/girlfriend in the early seasons of South Park, went so far as to have a substitute teacher arrested on false charges and locked inside a rocket launched directly at the sun, for the crime of having been the object of a brief crush from Stan. Even worse, the teacher was actually a lesbian, so she never had any interest in Stan, yet Wendy killed her anyway. What a bitch!
 * On Jimmy Two-Shoes, Heloise builds a robot double to be her assistant. She's very effective, but Jimmy falls in love with it. As you might expect, the robot didn't last the episode.
 * Sadira, from the Aladdin TV show, subverts this; she wanted Jasmine out of the way, but did not want her dead or seriously hurt, even explaining it in detail to a grunt.
 * Parodied in Phineas and Ferb in the episode "Suddenly Suzy" where we find out Candace is very aware of this trope and hides anything she thinks could be used to kill her before resident Yandere (disambiguation) Suzy arrives.
 * What makes this really Squicky is that Suzy is Jeremy's sister. Younger sister. Way. Younger. Sister.
 * Generator Rex features that Creepy Child minion of Breach's. She's never named, but she's absolutely obsessed with making Breach happy and tries to kill Rex when she realizes Breach likes Rex more.
 * One episode of Kid vs. Kat featured Coop going on a hike with a group of his friends, including his Implied Love Interest Fiona and his Stalker with a Crush Phoebe. Being a rather terrifying Yandere (disambiguation), Phoebe spends the entire hike trying to get rid of Fiona, even locking her in an abandoned cabin and then leading the others further along the trail so that they wouldn't hear her calling for help.
 * Hey Arnold!: In the episode "Arnold Visits Arnie" at the end of Arnold's Nightmare Sequence Arnie goes Ax Crazy when he thinks Arnold is stealing his girl and tries to attack him.
 * Foster's Home for Imaginary Friends: One episode featured a newcomer called Berry. Berry is initially sweet and polite, but once she develops a crush on Bloo she turns into psychotic Yandere (disambiguation) who continually tries to get rid of Bloo's best friend Mac so that she can have Bloo to herself.
 * Worse of all, Bloo barely even notices her and constantly forgets her name.

Real Life

 * Where to even begin? History and the Evening News are bursting with stories like this.
 * Countless examples of someone discovering an infidelity and killing either their partner or their partner's lover or both.
 * There's also countless examples of men and women who have murdered the boyfriends, girlfriends, husbands, wives, crushes, what-have-you of the person they're interested in.
 * Cesare and Lucrezia Borgia were widely rumored to have been lovers in an example of Did They or Didn't They?? of epic proportions. Cesare was believed to be extremely jealous of Lucrezia's second husband, Alfonso of Aragon, both for Alfonso's good looks (Cesare's face had been scarred by syphilis) and because Lucrezia seemed genuinely happy with her husband. Cesare had Alfonso attacked by his men in the middle of the night, but Alfonso survived. His men retaliated by shooting arrows at Cesare one day while he was in his garden. Cesare shortly thereafter had Alfonso strangled in his recovery room. Lucrezia was said to be devastated.
 * It should be noted that Lucrezia and Alfonso's marriage was quickly becoming a useless alliance, which also probably had something to do with Cesare's motives.
 * Peter the Great infamously had his wife, Catherine I,'s lover beheaded. He had the head preserved in a jar of alcohol which he forced Catherine to keep in her bedroom until his death.
 * The lover was the younger brother of Peter's first official mistress, Anna Mons.
 * Isabella of France and her lover Roger Mortimer led an invasion against Isabella's incompetent husband, Edward II of England, who was eventually forced to abdicate in favor of his and Isabella's son. When Edward was later murdered, Isabella and Mortimer were thought to be responsible. Once Isabella's son came of age and became King Edward III, he had Mortimer executed on fourteen counts of treason, including the murder of Edward's father.
 * While history books have long claimed that Mortimer and/or Isabella had Edward II murdered, more recent books, such as The Greatest Traitor by Ian Mortimer (No Relation) have argued that this was malicious gossip recorded by the writers of contemporary chronicles as fact. It has even been claimed that Edward never was murdered.
 * Henry Stuart aka Lord Darnley, the cousin and consort of Mary Queen of Scots, thought that his wife was just too close to her secretary, David Rizzio. So he and other nobles interrupted a reunion between them and stabbed Rizzio 56 times in front of the pregnant Queen, despite her pleas and a failed Go Through Me.
 * Of course, depending on if you believe she had a hand in it, Mary might have done the same thing to Henry so she could marry Lord Bothwell.
 * Does the death of a career count? This happened with WWE Superstars Triple H and Chyna. Chyna was dating Triple H when she started in the company, and he was the start of her success. However, a few years later, Triple H starts dating Stephanie McMahon and suddenly Chyna is dropped back down into the Women's Division (Up until then, her entire gimmick was being a Hot Amazon who fought the male wrestlers) before getting fired completely. It's still unclear what happened here, either Stephanie didn't like her boyfriend's ex hanging around all the time, or Triple H (who is somewhat infamous for being an opportunistic ladder-climber) realized that Chyna had made him as big of a draw as she could, and simply threw her aside before moving on to Stephanie (who is head of Creative Writing and the boss's daughter.)
 * One episode of Deadly Women on Investigation Discovery featured a case of this where "Alice" was in on it. The woman had a pattern of getting married, meeting another man, convincing the other man to kill her current husband, marrying the other man, then meeting another man...What made the plan nearly foolproof was that the other man usually did all of the killing, and then the next man would kill that guy, so that there was virtually no proof of the previous crime.