Killed to Uphold the Masquerade

""I'm here because you can see me, simple as that.""

- Cameron Hunter, Shadownova

So, our Intrepid Reporter has discovered the world behind the Masquerade, and she refuses to uphold it, destroy it, join it or get Laser-Guided Amnesia, and in fact will go public with her discovery.

The heroes will try to reason, plead, and maybe even threaten her into not going public. She may not care that, once exposed, those hidden by the masquerade will be persecuted and killed (which may be her goal if many of those protected are evil), or that The World Is Not Ready to know, or that it would generally just be a Bad IdeaTM.

The heroes then get to work. Try to destroy the evidence? She made multiple off-site backups. Bribery? She either doesn't want money, or figures the exposé will make her rich. Blackmail? She doesn't care about her reputation. Mind Control Device? She wears mirrored glasses.

She has to die now.

In a Crapsack World her death is pretty much guaranteed; good characters/players will probably agonize over this choice but ultimately do what they must and Shoot the Dog. If the author wants to let the heroes off the hook, then Big Damn Villains may come along and kill her for the heroes so they can avoid doing the deed, but not the guilt over having almost done it/strongly considered it. Often, this involves either faked suicide, suspicious accident, or messy murder.

If the author is particular about not wanting blood on anyone's hands, the character may simply get Put on a Bus or suffer a fatal accident through their own fault. (Not that the readers won't know what is up.) The heroes may still feel guilty for covering up the details surrounding her death.

Expect her death to either go completely unnoticed... or call the attention of The Hunter in a later episode/story.

May be an Elephant in the Living Room if this or Easy Amnesia are never brought up in a series with The Masquerade, especially one managed by good guys. A leading cause of The Masquerade Will Kill Your Dating Life.

A notable aversion would be when the reporter experiences something so horrific at the hands of the villain that she comes to believe that The Masquerade is necessary, and from then on helps the heroes to maintain it.

Anime and Manga

 * Depending on your Point of View, (Whether the actions of Light are good or evil) this is pretty much the crux of most of the plot points in Death Note.
 * In the first Hellsing anime, a reporter is intent on releasing footage of vampires and is 'sentenced' to death by being drained by Alucard. In Integra's defense, the reporter had stood idly by recording a sadistic vampire as he savagely fed on a human, never even trying to stop the vampire, save the victim or report the vampire to... well, anyone.
 * More than that. The reporter was the one who organized the entire thing.
 * Jumped the gun in Gantz, Gantz orders.
 * Gunslinger Girl. Captain Raballo is reported dead in a car accident right after a scene where we saw him contacting a journalist.
 * Earlier than that, a young employee of a hotel is shot when he sees Rico after a kill. It's even worse since they had become friends earlier, but Rico is so brainwashed (or grateful for being able to walk) that she shoots him with a smile.
 * In Saint Seiya, each and every female Athena Saint had to use a mask and never let any man see her face. If one ever did she only had two options: kill him, or love him. (Some fans have joked that the true reason was that Athena couldn't stand not being the hottest chick in the whole place.)
 * To be sure, this is more upholding a LITERAL masquerade (as in, people with masks) than the figurative one this trope is about.
 * Doesn't seem to be the case in The Lost Canvas, though it's uncertain if it's canon or not.
 * This rule gets broken by Shaina and Marin times in the series, so either Athena stop caring, or the female saints consider it more a question of personal honor than actual rule, or they learned to use loopholes like "I love him... as a brother". Or something like that.
 * In Code Geass, Rolo.
 * And Lelouch kills  as part of being Zero, against his own personal wishes.
 * In Fullmetal Alchemist  not only figures out the masquerade LONG before there's even an inkling of a clue, but also realizes that he's about to be killed, and tells Must- Oh. Wait. Nope. Too Late.
 * Attempted by the Student Police in Rosario + Vampire, when they discover that Tsukune is human. Luckily, his violently protective friends help him out, and an Emergency Transformation turns him Badass Abnormal right in the middle of the confrontation.
 * Lots and lots of people offscreen in The Castleof Cagliostro. Look at all those corpses in the basement. Most of them were killed either for political reasons or to keep the counterfeiting operation from being exposed.

Comic Books

 * In the second arc of Fables, a reporter discovers the fables are immortal... and thinks they're vampires! Bigby assembles a team and fabricates "evidence" that he's a pedophile (don't worry, Pinocchio is Really Seven Hundred Years Old and not at all naive, though frustrated he can't grow up) and blackmails him into staying silent. Bluebeard kills him anyway on his own, alleging he's not a softy like Bigby.
 * From Marvel Comics, Elektra's latest turn to villainy involves her killing a heck of a lot of 'S.H.I.E.L.D.' agents. It turns out she was on the side of good all along...she just had to kill flunkies to maintain cover.
 * An old Judge Dredd comic written by John Byrne had Dredd blow away a fellow Judge and thus get an in with a gang of crooks. It's okay, the fellow Judge had an incurable diseases and was in on the entire plan. The crooks ended up in a new jail.
 * A recent Batman storyline, Bruce Wayne: The Road Home, does this. Ra's al Ghul learned that Vicki Vale has deduced Batman's identity (and probably that of others) and has taken up the duty of killing her to make sure his adversary's legacy isn't tarnished. Averted, in that  is able to persuade Ra's from killing her and convinces Vicki to destroy the evidence.
 * In Doctor Strange: The Oath, a corrupt pharmaceuticals company bent on Withholding the Cure tries to prevent the release of a magic potion which can cure all diseases—by murder if necessary. The argument is that the world must never know a cure by magic is possible, and that humanity must develop at its own 'natural pace.' (The fact that this sort of thing would devastate their profit margin factors in, too). They get their comeuppance at the end, when one of Strange's allies finds the CEO's "we have to kill 'em all" memo and proceeds to fax it far and wide.

Film

 * Chillingly portrayed in the otherwise-mostly-comical, if somewhat immensely cynical, Wag the Dog -
 * Inverted in The Dark Knight a Wayne Enterprises lawyer discovers the resources diverted to support Batman, when he announces he's going public, The Joker tries to have him killed and Bruce Wayne saves him.

Literature

 * In The Destroyer, many people have died to uphold the Masquerade. In one of the earliest instances, the Director's assistant discovers CURE, a secret organization set up by President Kennedy to defend the country by working outside the bounds of the Constitution. The assistant then goes to The Director and tells him what he has discovered, and assures him he will never tell anyone. The Director has him killed anyway.
 * Notably averted in The Dresden Files: title character Harry Dresden is in the phone book under "Wizards." Normal humans who poke their noses into the supernatural do frequently end up dead, but that's simply because supernatural beings like vampires and fairies tend to be a) very dangerous and b) jerks.
 * Lampshaded in Proven Guilty when a vampire laughs at Harry when he threatens to expose him, claiming Harry wouldn't dare reveal The Masquerade. He is horrified when Dresden informs him that anyone can look him up in the phonebook under "Wizard."
 * At first Harry is hesitant to tell Murphy or the Alphas much about the real goings-on of the supernatural world, for precisely this reason; he notes that the White Council gets real uppity about vanilla mortals, especially law enforcement, knowing anything about them. Fortunately, the White Council doesn't really learn that Murphy is aware of their existence, and they're too busy with the whole war against the vampires to terribly care.
 * In Raymond E. Feist's Faerie Tale,.
 * Averted realistically in the Mercy Thompson books. If you've survived a run-in with the vampires and you're human enough for them to justify killing in the name of The Masquerade, go and talk to the media. You'll be seeing psychologists for the rest of your life, but the vampires will stay away from you.
 * This is part of Charles' job in the Alpha and Omega subseries. Humans who are attacked by werewolves, survive the encounter, and don't contract lycanthropy must be killed. It's one of his most hated duties, since he knows the human is innocent but cannot risk them warning the public about the dangers behind the Masquerade. This situation arises in Cry Wolf, but fortunately he is able to Take a Third Option.
 * In Conquistador, anyone who learns of the portal to the alternate earth becomes an 'involuntary immigrant', meaning that they are forcibly sent through the portal and are never allowed to return. While this isn't lethal, the fact that they effectively vanish without a trace from our world makes them effectively dead from the perspective of anyone who knew them.
 * Elena in Women of the Otherworld uses this as an excuse for one of the many times she ditches the pack. After killing a man who planned to auction off information on real life werewolves who couldn't be talked down, she's disgusted with herself for having made the choice to take his life so easily. This is a step up, really. In the past werewolves would kill anyone who came close to learning about them. The rest of the supernatural world seems to have long ago decided to give people a chance to keep quiet before silencing them, though.
 * A standing order in the dinosaur community of Anonymous Rex is that any humans who stumble onto the fact that humanoid dinosaurs are alive and living incognito in the modern world are to be killed for fear of backlash or persecution against the dinosaur races if mankind at large ever found out their existence. That dinosaurs are vastly outnumbered by humans gives them legitimate amount of concern, however, even the main character doesn't seem to have much of a problem with the morality of this policy.
 * The Volturi in Twilight, Their main job is to destroy vampires who attract too much attention to themselves. It was mentioned that they wiped out every vampire in Mexico when the vampire civil war there got out of hand.
 * This is standard practice of Monster Hunter International's antagonistic Monster Control Bureau.

Live-Action TV

 * This happens multiple times in Stargate SG-1. As the series is Backed by the Pentagon, the witnesses are never killed by the Air Force, but the SGC's rivals are always eager to Shoot the Dog for them. They often gloat about this, saying that the though SGC agrees that secrecy is paramount, they aren't willing to "make the hard choices", and take pride in murdering witnesses on their behalf.
 * In a second season episode, a reporter threatens to go public with knowledge of the Stargate. Seconds after dismissing O'Neill in public, a passing car jumps the curb, sends him flying, and speeds away. O'Neill is fairly sure that he was Killed To Uphold The Masquerade, but General Hammond says that to his knowledge, it wasn't an assassination. The audience never finds out for sure either way.
 * A Season Six episode has a reporter discover some evidence of one of the SGC's side programs. It turns out to be an NID plot, and the reporter is left empty-handed - but alive.
 * A Season Eight episode has an entrepreneur salvage some wreckage from a fight between the Asgard and Goa'uld in Earth orbit, and produce an empty Asgard clone to the press. He was going to be killed by the shadowy conspiracy, but the SGC rescued him via Asgard beaming, sending him to explore other planets (which he was happy to do). Of course, his case for the existence of aliens was disproved.
 * This was mostly because his company went bankrupt, causing him to lose all credibility.
 * The reporter and TV news producer who stumble upon the existence of the anomalies in Primeval conveniently run off into one such anomaly and wind up trapped (and presumably eaten) in the Mesozoic.
 * In the second season of Dexter, James Doakes discovers Dexter's secret. Dexter keeps him locked in a cabin for several days while he deliberates on whether to kill him, only to have Lila do it for him.
 * UFO. It's mentioned on several occasions that SHADO is prepared to do this, though we never actually see it, presumably because for the audience it would involve crossing the Moral Event Horizon.
 * In the reimagined Battlestar Galactica, follows  to discover a meeting of the four Cylons who live in secret in the fleet.  ensures that she won't live to tell anyone about it ...
 * In Charmed:
 * There's an entire class of demons (Libris demons) who are tasked with killing any ordinary mortals who discover that they exist.
 * As part of his series of criss-crossing alignments, Cole killed a man who threatened to blackmail Phoebe (Cole's love interest) with revealing the existence of her powers. That said, he did it mostly to protect her, but he used this as his justification to her.
 * In Alias, Sydney follows orders and stabs a man to death in order to maintain her cover as an assassin named Julia Thorne.
 * In Once Upon a Time, is killed moments after recovering his memories about who he really is.
 * Although the motive of the person who killed him was probably closer to If I Can't Have You.

Tabletop RPG

 * This is basically "Standard Plot Complication #3" in any gameline of The World of Darkness.
 * Vampire: The Masquerade and Vampire: The Requiem in particular. Considering the former had vampires close to being wiped out during the Inquisition in Europe, and the prevalence of modern telecommunications, vampires are very aware that any slip could destroy their entire species... which, considering most are just shy of being Complete Monsters, this would be a good thing for humans.
 * Usually averted in Mage: The Awakening. Even the Guardians of the Veil, the most secrecy-obsessed and Dirty Business-prone of the Pentacle orders, considers killing humans who might break the Masquerade an absolute last resort, and mages have a great number of other ways to deal with troublesome Sleepers.
 * Averted in the Infinite Worlds setting for GURPS, though only just. The Infinity Patrol have it as an ironclad policy that they will not kill people just to protect The Secret of parachronics. They've got memory erasure drugs, they can conjure up plausible explanations, discredit witnesses, and even just ask nicely, but they won't kill. When all else fails, they'll kidnap those who Know Too Much and put them on a Prison Planet, but even that's exceptional and sometimes Dirty Business.

Web Comics

 * In Shadownova the Everto do this a lot. One attack on a group of people who can see through the masquerade sets the entire plot in motion. Cameron, one of the Everto, then tries to make Iris, the only survivor, feel like it's her fault everyone had to be killed because she could see through the masquerade even though the ability to do so is completely involuntary.

Web Original

 * Averted in the Protectors of the Plot Continuum. The offending characters are either neuralysed or recruited, depending on their importance to the main story of their continuum or how easily they would merge with canon.
 * The SCP Foundation doesn't shy away from doing this when necessary. They prefer treatment with amnesiacs when possible.

Western Animation

 * Batman Beyond has a sleazy reporter who has the power to become incorporeal, and who uses this power to discover Batman's identity. Nothing Bruce or Terry can say or do will convince him not to reveal Batman's identity on live television, which poses quite the problem since Batman, of course, doesn't kill people, even for his secret identity. Conveniently, the issue is settled for them when the reporter loses control of his powers, ultimately helplessly falling through the floor... and presumably continuing to fall until he reaches the Earth's core.
 * In Transformers Prime, the Decepticons are quite willing to kill any human that sees a giant space robot. The Autobots save 3 of them, and they end up as the human sidekicks, since if they want them dead anyway, they might as well be standing next to the other giant robots who can protect them.

Video Games

 * In Assassin's Creed: Brotherhood some of the audio files in Subject 16's data suggest this is what the Templars do to people in the modern day.
 * One of the audio clips has a reporter discussing some findings about Abstergo in a car and being listened too on a hidden microphone. Some Templar agents then casually discuss eliminating him.
 * Another clip has a man finding a hidden TV channel with his bio signs and other information on it, he telephones the TV company (Abstergo) and the company sends a "technician" who breaks down the door. Call ends.
 * Made even more disturbing by the child in the background yelling, "Dad! Someone's at the door!"
 * An option in Dragon Age: Origins when dealing Brother Genitivi and Andraste's Ashes, if you decide you want no one to know they really exist.
 * Ser Jory is killed when he tries to back out of the joining, after watching Daveth die, though it probably didn't help that he pulled a sword on Duncan.
 * This is the logic behind Lancer killing Shirou in the opening of Fate/stay night. Granted, Shirou gets better, and it was really kinda pointless because Shirou already knew about magi and magecraft, being one himself. However, Lancer had no ability to know that, Shirou didn't try to correct him, and Lancer's master is a Card-Carrying Villain.
 * In Vampire: The Masquerade Bloodlines, the plot starts with the vampire that Embraced the Player Character getting offed for a Masquerade Violation, and you can get at least three quests to kill someone who's threatening, or in one case has already broken, the Masquerade. You also run into someone who knew you before you were Embraced, and if you can't convince her you're not who she thinks you are, you have to kill her before she makes a phone call or receive a Masquerade Violation.
 * Smiling Jack from the tutorial summarizes the Masquerade thus: "We're living in the age of cell phone cameras; fuck-ups ain't tolerated!"