Death of the Hypotenuse

"Even death has a soft place in his heart for such a paragon, and remedies all mistakes for her just at the right moment. The vicious baronet is sure to be killed in a duel, and the tedious husband dies in his bed requesting his wife, as a particular favour to him, to marry the man she loves best."

- George Eliot, Silly Novels By Lady Novelists

Alice, Bob, and Charlie are in a Love Triangle. Alice loves Bob, but also has feelings for Charlie -- or maybe she doesn't, but can't or doesn't want to turn him down (maybe she's even in a relationship with or married to Charlie while pining after Bob). However will she resolve this dilemma? Well, fortunately, she doesn't have to -- Charlie meets with a convenient illness, accident, or other such fatal situation, freeing Alice up to go after Bob without guilt. If Charlie is aware of Alice's feelings for Bob, he may tell her with his dying breath that she shouldn't mourn him too much, because he wants his beloved to be happy.

This trope is where The Plot Reaper meets Cleaning Up Romantic Loose Ends. If Charlie's death is not so accidental, it's Murder the Hypotenuse or The Uriah Gambit, depending on whether it's done directly or set up indirectly. See Comforting the Widow. Compare to Ship Sinking.

May still be a Bittersweet Ending and even lead to Dead Guy Junior.

Spoilers may be within.

Anime and Manga

 * In No. 6 this happens to  Though it's really more of a case of
 * In Inuyasha, the Inu Yasha - Kikyou - Kagome triangle is finally broken when
 * This love triangle was also a bit strange when one considers that Kagome is Kikyou's reincarnation, possessing the same soul, and thus are in some ways the same person.
 * In Mahou Sensei Negima, Haruna references how common this happens in Japanese literature when it's revealed that Yue likes Negi in the same way that Nodoka does. The fact that both Yue and Nodoka are standing right behind her as she does this didn't help the situation at all.
 * This is later completed when Yue has amnesia and is nowhere to be found (until now).
 * And then it's subverted, as even with the amnesia, she apparently has feelings for Negi anyway.
 * In Love Hina, described in volume 9 of the manga, Haruka, Seta and Sarah's mother were a Love Triangle. Seta had promised to choose by the time he turned 30, but Sarah's mother died; Haruka refused to accept victory by default, and rejected Seta for years afterwards.
 * This is what breaks up the Sibling Triangle between twins Tatsuya and Kazuya and their neighbor Minami in the manga Touch. Right before Kazuya was going to ask Minami's dad for his blessing, too... ouch.
 * In Yu-Gi-Oh, Anzu has a Two Person Love Triangle between Yugi and Yami..
 * Highschool of the Dead: This actually makes things worse for the hero since
 * Psychic Academy: The love triangle between Ai, Orina, and Mew ends with  death. In a subversion of this trope, Ai.
 * Macross Frontier: subverts this. Near the end
 * The movies, meanwhile
 * Neon Genesis Evangelion: The main love triangle between Shinji, Asuka and Rei ceases to exist when  pulls a Heroic Sacrifice to save Shinji, shortly after arriving at the realization that she "wants to be one with him". As a sort-of deconstruction,   ends up doubting the sincerity of Shinji's feelings, accusing him of comming to her because she's basically the only one left, since   at this point.
 * Many Bleach HitsugayaxMatsumoto fans see  as this.

Comic Books

 * In X-Men, Cyclops making it out with Emma Frost -- almost literally on his dead wife's grave. In this case, the dead wife made them do it with her psychic powers, or rather, the future resurrected her did it, but still perplexing, since there were plenty of other ways she could have made Scott stay that were a lot less tacky.
 * And later works and materials tried to present it as Emma being there for Scott after Jean died, which is contradicted by the above moment, since he supposedly lost the feelings he needed comforting over.
 * Why can't a future resurrected Jean who wants her beloved to be happy?
 * of Strangers in Paradise.
 * In Whatever Happened to The Man of Tomorrow,.

Film

 * in the Starship Troopers movie.
 * Very, very common in war films (all countries, all periods) generally, to the extent that a Pair the Spares solution is the exception to the rule.
 * As one such example, Pearl Harbor.
 * In The Searchers, Martin Pawley finds himself in an Accidental Marriage to a Comanche woman, nicknamed Look. Naturally, this gets in the way of his relationship with Laurie Jorgenson. When Martin tries to press Look for information about the killer he's tracking, she panics and runs away. Martin later finds her dead-- killed by the US Army in an attack on a Comanche camp.
 * A tragic example in Crouching Tiger Hidden Dragon, where Shu Lien's fiancee was killed in battle and also happened to be Mu Bai's best friend and sworn brother. For years, the two of them refused to pursue a relationship with each other, to honour the memory of their friend/fiancee.
 * First Knight has it with King Arthur's death, leaving Guinevere free to hook up with Lancelot.
 * in 2012.

Literature

 * The Fifth Elephant: It happens to . Implied that narrativium was working heavily in favour of the suitor that survived.
 * Another interpretation is that
 * Mandorallen, The Baroness of Vo Ebor and The Baron of Vo Ebor in David Eddings' Belgariad. In the fifth book, the Baron is seriously wounded. In one of the first books of the second pentology, the Malloreon, the Baron dies as a result of his injuries, but Mandorallen and the Baroness don't get together until a new hypotenuse shows up - the Baron's heir. Finally sick of the moping, and the incipient civil war looming between Mandorallen's family and the Baron's, Belgarion storms in and orders Mandorallen and the Baroness to marry and get it over with, paying off the Baron's heir just to make sure everything stays settled.
 * Patricia Kennealy's The Silver Branch, first book of the Keltiad: The protagonist, Aeron marries Roderick because her parents wish her to. Roderick and her parents die in the same well, murder. She then marries Gwydion, which was what she had wanted but her parents thought a pair of magic-wielding royals to be too scary.
 * In the novel Mary of Marion Isle by H Rider Haggard, the wicked accidental wife accidentally drowns allowing the hero to marry to marry the heroine who is his soul mate.
 * Happens in Rose in Bloom to solve Rose's "which one of my cousins do I marry?" dilemma, when the Troubled but Cute one takes himself out via horseriding accident.
 * In The Night Angel Trilogy, the protagonist's first love has to make a Heroic Sacrifice, and before doing so, wishes him happiness with the other contender.
 * Subverted in the Harry Potter books. In Harry Potter and The Goblet of Fire, Harry is in a love triangle with Cedric Diggory and Cho Chang. At the end of the book, Cedric dies, leaving Cho free. In the next book, Harry and Cho hook up for about twelve seconds before their relationship implodes and we never hear from Cho again after that.
 * We do. She makes a cameo in book six, and in book seven she fights with the good guys, and we have a jealousy scene by Ginny. And Word of God is that she married another man. It's just that Harry doesn't have the slightest interest for her anymore.
 * Harry Potter and The Deathly Hallows also subverts this with the reveal that Snape was hoping for this in regards to James, who was Happily Married with Lily. He had begged Voldemort to spare Lily, but when the time arose Voldemort killed her anyway. This ended with James and Lily being Together in Death while Snape was alone once more.
 * This also means that Snape couldn't have cared less that Lily's son Harry was the target of the entire assassination attempt, maybe even seeing the infant as just another part of the hypotenuse. That's just cold. Dumbledore does call him out on this.
 * Semi-averted in Cyrano De Bergerac. After Christian dies, Cyrano has the opportunity to reveal he wrote the letters and finally receive Roxane's love, but he withholds the information so that his beloved Roxane's memory of Christian won't be tarnished.
 * In Bujold's Komarr, Imperial Auditor Miles Vorkosigan finds himself falling in love with the wife of an administrator peripherally involved with an apparent terraforming accident (and the feeling is, unbeknownst to him, mutual). Tien Vorsoisson (the administrator in question) turned out to be involved in an embezzlement scam, Ekaterine (the wife in question) decided to leave him over it, and then Tien ended up accidentally killed by the conspirators when he tried to sell them out to Vorkosigan. Too bad things got classified enough to create a whole new set of barriers in any courtship.
 * This is how the love triangle in The Castle of Otranto (the first Gothic Novel) was resolved, although it's a bit of an unusual variation. While the two surviving sides of the triangle do marry, they're both deeply distraught over the death (as the two love rivals were quite close friends), and it's said that part of the reason they get together is that they know that no one else will fully understand their grief.
 * In Juliet Marillier's Heir to Sevenwaters, the heroine starts out courting Aidan before realizing she has feelings for Cathal. This dilemma is resolved when, preventing Clodagh from having to make a hard decision.
 * Lolita. Charlotte wants Humbert; Humbert wants Lolita. Charlotte dies in a freak accident.
 * In Samuel Shellabarger's novel Prince of Foxes, the adventurer Andrea Orsini and the lady Camilla Varano discover an increasing attraction to each other which both resist out of respect for her Cool Old Guy husband Lord Varano. Varano dies heroically during the climactic siege of Città Del Monte, pushing Andrea and Camilla into each others' arms with his dying words.
 * Middlemarch: Mr Casaubon tries hard to avert this in George Eliot's novel, by forbidding Dorothea from marrying Ladislaw in a codicil to his Will, on pain of having her inheritance stripped.
 * Troika. Poor, doomed.
 * The HIVE Series: Zero Hour resolves the  love triangle by having  . Since that was the latest book, the after-death hook-up hasn't happened yet, but it seems like a foregone conclusion that it will.
 * Warrior Cats: Brambleclaw and Ashfur both love Squirrelflight. Subverted in that.
 * In Sweet Valley University, Elizabeth breaks up with her long term boyfriend Todd and he begins dating another girl, Gin-Yung. Gin-Yung conveniently contracts a brain tumour and dies, using her last words to tell Todd to get back together with Elizabeth.
 * S.L. Viehl's Stardoc. Poor, doomed.

Live Action TV

 * Degrassi High has a baroque (and to me, rather creepy) example. In the first season, Caitlin dumps Joey because he's rather immature, and because the new kid Claude seems so much more her type. But Claude turns out to be an ass and she dumps him too. In the second season, Claude is thinking of suicide (due to unrelated problems that Caitlin doesn't know about). Desperate for any hope, he asks Caitlin out again, and she tells him to get lost. When she gets home, she finds Claude has sent her flowers and his suicide note. As she's screaming with rage and guilt, her science teacher orders her to tutor her old ex-boyfriend Joey. He's had a lot of Character Development over the course of this season, and comforts her during the tutoring. Soon, they're back together again.
 * Farscape: meets this fate at the end of season one -- the penalty for coming between Official Couple Aeryn and Crichton.
 * Interestingly, so does . For the same reason.
 * Dollhouse: Mellie loves Paul. Mellie leaves. Paul loves Echo. Echo loves Paul. Mellie returns - Paul loves Mellie too. Mellie dies. Paul and Echo can be together!
 * Parodied in a Mad TV skit, where two lovers are trapped in the middle of open water, along with their beautiful diving instructor. The second the husband goes with the female diving instructor, Kelly Clarkson, Kelly dies.
 * Lost: Possibly happens to in the season 5 finale. Seeing as this death would mean the death of a whole bunch of other main characters, if inconsistencies are to be avoided anyway, the character may not be dead. Although since  is due to be the lead on another show this summer it seems the death was permanent.
 * Neighbours totally killed off for this reason and this reason alone. Apparently the writers didn't want to ruin the apparently endless opportunities for a good teenage romance plot by a marriage. It was a storyline that many fans hated because the two were always portrayed as happily married and madly in love.
 * Noahs Arc:.
 * Noahs Arc:.


 * Home and Away: Belle was killed off, apparently paving the way for Aden and Nicole.
 * Tayong Dalawa (lit. The Two of Us): Filipino prime time drama, where this is rather overdone. The show's title is ambiguous title. It could either mean the two half-brothers, or one of them and the girl. It gets hyped up in a Tonight Someone Dies preview,
 * Played with in Choujin Sentai Jetman: after a series-long love triangle between Ryu, Kaori and Gai, the Where Are They Now Epilogue shows that is fatally knifed by a bandit on his way to  and Kaori's wedding. However, by this time he had come to accept them as a couple, and makes it to the wedding to congratulate them before he dies.
 * would also count as this, since death gives  the closure he needs to finally begin a relationship with Kaori.
 * Downton Abbey has die suddenly of Spanish Flu at the end of series two to make way for.
 * Earlier in the series, Vera Bates unexpectedly commits suicide, allowing Bates to marry Anna. Not that this actually makes things any easier, since he's now the prime suspect for her "murder".
 * In Terra Nova, Josh wants to bring his girlfriend there from the future, even going so far as to make a deal with the Sixers to do so. His pretty female friend Skye decides to help, despite the fact that she obviously likes him. The Sixers manage to get his girlfriend on the next pilgrimage,

Theatre

 * Eponine's death in Les Misérables (in the book she was more of a Stalker With a Crush than an actual romantic option, though).

Video Games

 * Happens in Tales of Monkey Island episode 4, when.
 * Final Fantasy VII: The Love Triangle between Cloud, Aeris, and Tifa ends when Aeris dies. Amazingly enough, there's still Shipping Wars between Cloud x Aeris fans and Cloud x Tifa fans, arguing who Cloud loves.

Web Comics

 * Averted very notably in Girl Genius, where a major plot arc involved the heroine and her love interest curing the other love interest of a fatal disease (okay, so they did kill him a little bit, but it was more of a rolling death, and he has recovered now).
 * An earlier hypotenuse, an actor named Lars, did die, but neither of Agatha's primary love interest were ever aware of his existence, much less his removal from the equation.