Dead Person Impersonation

The ploy of taking over a dead person's identity.

This can be for any number of reasons. Perhaps the character was a drifter, with no identity of their own worth speaking of and enticed by the possibility of assuming the role of their recently deceased acquaintance. They may have promised to protect the person's loved ones, want to escape their old life, or less heroically intend to con their new "family" out of money. If anyone questions their changed appearance, accent, or other details, there's often a Conveniently Unverifiable Cover Story they can use to explain it away.

Usually the impostor will end up Becoming the Mask, falling in love with the life that isn't his, and be exposed. Happily, though, he will regain the trust he lost by some act of heroism, and remain among his new loved ones. Whether it's with his own or the new name varies.

More maliciously, a villain will do this after they kill the other person. A common occurrence in murder mysteries is for the killer to do this in order to throw off the time of death and give themselves an alibi. Having such an impersonation can create Dramatic Irony if the audience is aware of the ploy, or a plot twist if they are not.

Occasionally the impostor will be played sympathetically, in which case they may be forced to assume the dead person's identity to escape death themselves. Or, in a subversion, they could have been misidentified after a mass-casualty incident, and refrained from pointing out the mistake due to fear of prosecution, sympathy for the dead person's loved ones (who believe the deceased "miraculously survived!"), or even amnesia.

Compare My Sibling Will Livethrough Me. Contrast The Mole, Rags to Royalty, The Real Remington Steele, Prince and Pauper. Contrast Lost in Character, where a professional actor takes on a role and forgets their original self. If you don't just take the other person's identity, but also their appearance, it's Replicant Snatching. If it's a temporary thing, a sort of masquerade where characters pretend the dead one is alive, it's an Of Corpse He's Alive situation, or the El Cid Ploy. If you're a time traveler, and are doing this so history stays on track, its You Will Be Beethoven.

Anime and Manga

 * Basilisk's Kisaragi Saemon is the reigning champion of this trope, due to being a Master of Disguise and a skilled Ninja. Of course the show being what it is, it eventually comes back to bite him in the ass.
 * Monster's Johan likes to steal the identity of parents' dead sons.
 * Char Aznable from Mobile Suit Gundam is apparently one of these, but only in the Alternate Continuity manga Gundam: The Origin. In it, we find out that the Char we know - "Casval Daikun", in hiding as "Edward Mass" - befriended a real Char Aznable, a young man physically identical except for their eye colors. Due to a Twin Switch and an assassination attempt by the Zabis, the "late" Edward assumed the identity of the late Char, using Cool Shades and an equally Cool Mask to help avoid suspicion.
 * Which backfires massively when he
 * Something somewhat like this happens in Pretty Face. Masashi Rando survives a bus crash and awakens from a year-long coma to find that a talented but insane plastic surgeon reconstructed his face... based on the picture of his crush in his wallet. On fleeing the doctor's office, Rando learns that his family is gone with no forwarding info and that pretty much everyone hated him. Then he runs into his crush... who assumes he's her long-lost twin sister. He keeps up the charade because the girl really missed her sister.
 * Used with quite a twist in G Gundam.
 * Also used with a twist in Gundam Wing.
 * in Clannad After Story, who took the identity of the person he was close to so he can complete his last wish after he died.
 * in Mirai Nikki; No reason why or who it really is for now.
 * It actually turns out that  It's... complicated.
 * Used in The Kindachi Case Files.
 * from Fushigi Yuugi taking up his Dead Little Sister's identity is a classic example.
 * A variation occurs early in Shakugan no Shana. Yukari Hirai, the girl who Shana assumes the identity of, isn't just dead; rather, Yukari faded away from existence. And we get to see how this happens.
 * In Vagabond, a highly fictional telling of the life of Miyamoto Musashi, Musashi's childhood friend Matahachi finds a certificate of swordsmanship on the body of a samurai who had been kind to him earlier. He decides at first to deliver the certificate to the samurai's family, but soon finds it easier to pass himself off as the samurai instead and live off the dead samurai's reputation.
 * Code Geass has a very confusing example thanks to
 * Used in a Detective Conan case.
 * In Revolutionary Girl Utena,
 * In Naruto,
 * Yu-Gi-Oh 5 Ds:
 * Michio of MW impersonates Miho and Mika, the daughters of his targets.
 * In the Read or Die manga, Paper Master Ridley Wan disguises himself as Yomiko's deceased lover Donny. He does such a good job that Yomiko doesn't realize the deception until he voluntarily unmasks himself - after she slept with him. Quite impressive, when you consider that not only had Yomiko been present when Donny died,

Comic Books

 * In Excalibur, evil other-dimensional dictator Sat-Yr-9 vaporized Courtney Ross, her counterpart in this reality (and incidentally a love interest of Captain Britain), and then calmly stepped into her shoes. The deception wasn't exposed for quite some time.
 * Quality Comics character the Black Condor adopted the identity of murdered Senator Thomas Wright. Who just happened to look exactly like him.
 * If memory serves, Batman's "Matches Malone" persona was swiped from a real guy who got himself killed in Bats's presence.
 * Also from Batman is Jane Doe, a definitely villainous example. She doesn't just kill her new identity; she studies them down to the last detail, perfectly recreating his or her voice, body language, and thought patterns. It would be less creepy if she was actually a shape shifter, especially since this lack of superhuman ability makes her finishing touch of skinning her victims and wearing them as suits a necessary part of her modus operandi.
 * In the Firefly comics, it's revealed that  did this some time before joining Serenity's crew.
 * In her first appearance, the Golden Age Wonder Woman, fresh from Themiscyra Paradise Island, has a chance encounter with an Army nurse named Diana Prince, who's distraught because she lacks the funds to join her fiancee in South America. They look exactly alike, and thus, Princess Diana pretty much buys Lt. Prince's identity from her so that she can afford to, well, desert.
 * A slight variation appears in the back story for Cybersix, who poses as a man by day because her Secret Identity was lifted from a young boy who died with the rest of his family in a car crash. She didn't know the boy beforehand; she just found the body and realized he looked a lot like her.
 * Strangers in Paradise's David Qin was born Yousaka Takahasi, the son of a prominent Yakuza family and a member of one of the numerous violent teenage gangs. He accidentally killed the Chinese-American David Qin after administering a brutal, and completely pointless, beating in the street. His influential father and his lawyers got him off on all criminal charges, but a confrontation with David's sister, combined with his already considerable guilt, led to his taking David's name and abandoning the criminal ways of his youth and family.
 * Isn't this technically what Martian Manhunter does? By happy coincidence, his name even sounds like the dead man's (Jonn Jon'zz / John Jones).
 * At the end of the V for Vendetta graphic novel series, Evey assumes V's identity after V dies.
 * False Face attempts to do this to Lady Blackhawk in order to infiltrate the Birds of Prey, but ends up having her ass kicked by her would-be victim by the end of the issue.
 * In the Postboot Legion of Super-Heroes continuity,
 * Before the reboot, it was broadly hinted in one Annual that . After that annual it was never mentioned and the title was retconned the following year anyway.
 * The modern version of the Spider Man villain the Chameleon uses this. He studies, kidnaps and murders his victims before spending a day living that person's life. Quite a violent upgrade for a guy who used to simply leave his victims tied up and gagged in their undies so that he could steal their clothes.

Film

 * A major plot point in Alfred Hitchcock's Vertigo.
 * Taking Lives
 * Sommersby tells the Martin Guerre story in the setting of America right after the Civil War.
 * Mrs. Winterbourne is a Lighter and Softer version of the Cornell Woolrich novel mentioned in the Literature section.
 * In There Will Be Blood
 * Ace Ventura: Pet Detective: Disgraced kicker Ray Finkle literally becomes Detective Lois Einhorn when s/he goes insane after missing a potential game-winning field goal kick in a Super Bowl. The real Lois Einhorn was a missing hiker, whose article about her search being called off, gave Finkle the idea to become a woman to kill Dan Marino.
 * Unless, of course, he was actually the one responsible for Einhorn's disappearance in the first place, which makes him even more of a Complete Monster.
 * This is the premise of Houseguest. Sinbad is on the run from the mob and finds Phil Hartman and his family waiting to pick up his childhood friend, so Sinbad impersonates the friend and goes with them. When he's caught, it fortunately turns out that the friend grew up to be a jerk.
 * In X Men I & II this is standard operating procedure for Mystique. She impersonates Senator Kelly's aide who Magneto casually mentions "has been dead for some time" then effectively becomes Senator Kelly after his artificial mutation apparently kills him.
 * Used by the murderers in Double Indemnity to make it appear that the victim was killed by falling from a train -- a vital component of their Insurance Fraud scheme.
 * The main character in Detour hitches a ride with a man who dies soon afterward. He takes the dead man's car and identity. Of course, this being film noir, he soon encounters a dodgy dame and things go from bad to worse.
 * Akira Kurosawa's Kagemusha (Shadow Warrior). A thief is hired to impersonate a dying daimyo, and given stringent training by both the daimyo's brother and his retainers, in order to prevent the province from being destroyed by ongoing power struggles after the daimyo's death. Originally supposed to be merely a figurehead, with all power wielded by the deceased mans's retainers and family; he gradually takes on more power and responsibility, along with his personality coming to increasingly resemble that of the dead man.
 * Die, Mommie, Die!: The
 * The Majestic where the character played by Jim Carrey has amnesia following an automobile accident and is found in rural California, where he is mistaken for a local war hero thought dead. For most of the middle of the movie, he tries to fit into the mistaken identity role without really knowing who he is.
 * A variation of this forms the basic premise of Dave. Everyman Dave Kovic bears an uncanny resemblance to the sitting US President, whose handlers hire him as a body double for "security reasons" (read: to cover up the President's extramarital affairs). The President has a massive stroke which leaves him comatose, and his handlers coerce Dave into assuming the President's identity.
 * Fantomas does this often, especially in Marais/de Funes movie adaptations. Usually, he's also the cause of death.
 * Nicely subverted and played straight in Ridley Scott's Robin Hood 2010. Played straight in that when  dies,   takes on his identity as the messenger to avoid being killed as a deserter from the army, and also to return the crown to the royal family. Subverted in when   and doesn't pretend to be anything other than who he is. Then played straight again when
 * After escaping the prison, Dr. Niemann in House of Frankenstein orders his new hunchback assistant to kill a travelling showman and takes his place and uses to get near those who got him to prison.
 * Friday the 13 th Part 2 has the Final Girl attacking Jason while pretending to be his mother.
 * This scene was straight ripped off in Death Valley: The Revenge of Bloody Bill.
 * The final girl in Humongous uses a similar method to avoid the killer.
 * In the film Sommersby, (a remake of The Return of Martin Guerre) a man returns from the Civil War. Previously a Jerkass, he now makes the town a better place by getting bank loans for farmers and former slaves. Then the police arrest him for murder..
 * The Stepfather had a sequel where the titular stepfather escapes from a mental institution and assumes the identity of a random guy he saw in the obituary section of a newspaper.
 * In "Imitation General" an army general visiting an area under German siege is killed and his aide realizes that only the sight and authority of a high ranking officer can hold the trapped soldiers together. He takes the general's place even though he knows his action could save or cost lives and make or break the general's reputation. It's a comedy though so...
 * In Barbarosa, fugitive Karl Westover is befriended in the desert by the title outlaw, who introduces him to a Mexican clan with whom he has a tangled relationship. When one member of that family
 * In The Bridge On the River Kwai, it's revealed that "Commander Shears" was actually an enlisted man serving under Shears aboard the USS Houston. After the ship was sunk and Shears killed, the seaman (whose real name we never learn) switched uniforms with him and took his name and rank in the hope of getting better POW treatment from the Japanese.

Literature

 * A major plot twist in John Dickson Carr's book  involves this.
 * Agatha Christie did it at least twice, both in  and
 * In a plot twist not used for the book version of And Then There Were None,  This is also used for the game, where
 * And a related plot twist was used in
 * Agatha Christie does it twice in Hercule Poirot's Christmas, when Pilar and Stephen Farr are both impostors, who opportunistically decided to take the identities of Simeon Lee's grand-daughter, and his best friend's son.
 * HP Lovecraft's The Whisperer In Darkness, in a way.
 * Dorothy L Sayers used the short-term "throw off the time of death" variant at least twice, in Whose Body? and The Five Red Herrings.
 * For the malicious version, in The Talented Mr. Ripley, he kills his friend and takes his identity for a while.
 * Doom of the Hills in Deltora Quest.
 * Happened in one Poirot novel.
 * Josephine Tey's mystery novel Brat Farrar has an interesting use of this trope, as it's about a young man who starts off as the malicious version, passing himself off as a member of a wealthy family who disappeared as a child, but then turns detective when he realizes that the boy he's pretending to be died and anyone not believing his charade is likely to be the murderer.
 * Used in Cornell Woolrich's novel I Married A Dead Man, where a poor young woman who is pregnant and has been abandoned by her lover meets a wealthy pregnant woman on a train who looks similar to her along with her husband. When the train crashes and the couple is killed, the poor woman passes herself off to the husband's family as his wife.
 * Benoit Notre-Dame turns out to have done this in A Very Long Engagement, although he's only really taken the dead man's name, and still lives with his own wife.
 * Father's Arcane Daughter by E.L. Konigsberg.
 * The short story Improbable Impostor Tom Castro by Jorge Luis Borges revolves around the eponymous character's success as an impostor by virtue of being entirely dissimilar from the person he's impersonating.
 * One The Witcher short story involves a doppelgänger assuming the identity of a dead inquisitor. Nobody catches on, despite a rather radical shift in personality (they assume the man has changed due to a near-death experience and generally being old).
 * In Animorphs, David uses this after acquiring the DNA of who was in critical care. As morphing constructs the form anew from DNA, he has no injuries and is perfectly healthy. The family was overjoyed, thinking that a miracle occurred, but Jake knew better ... Whether or not David actually killed  isn't addressed, but he's definitely dead, and Rachel indicates they eventually find the body.
 * In Star of the Sea, one of the principal characters kills a man and takes his identity because he believes he'll die otherwise (he's a cripple with no way to support himself). However, none of the people he convinces had ever met the real man before, and he eventually gives up the pretense and disappears when the real man's mother starts wondering why he's not answering her letters.
 * An odd version of this happens in the novel Over the Edge. Gina is on a plane that gets hijacked, and the hijackers specifically call out for one passenger, the daughter of a senator. Gina is the only one on the plane who knows the girl didn't make the flight due to lost paperwork, and she bears a resemblance to her anyway, so she claims to be Karen.
 * Iain M. Banks
 * Use of Weapons. Book-spoiling spoiler:
 * In Consider Phlebas, another novel set in The Culture, the shape shifting Anti Hero does this a couple of times.
 * In a twist, Giles Denison, the main character of Desmond Bagley's spy thriller The Tightrope Men, has been press-ganged (with plastic surgery and partial brainwashing) into playing the role of scientist Harry Meyrick. Meyrick is a brilliant jerk who "uses sarcasm as a weapon, but if you put him in a real fight he'd collapse. Denison is a quiet-spoken, civil man" who handles himself quite well in a tight situation. And neither he nor the British agents he's helping know who turned him into Meyrick's double or why.
 * Done in the X Wing Series in a way that straddles this trope and Of Corpse He's Alive. The Wraiths captured a small ship and killed its captain before anyone could send a message back to the enemy fleet; hence the enemy was unaware of this. They decided to continue the ship's mission, masquerading as the original crew of the Night Caller, including her wildly egotistical captain - if he'd stopped commanding, the enemy would've noticed.
 * Timothy Zahn's Hand of Thrawn Duology has a triumvirate of villains collectively contriving to make it look as if Grand Admiral Thrawn has returned from the dead. One member handles supply, demand, and political fallout, one member composes tactics and strategy and expands on the triad's plans, and the third pulls off a very good acting job, aided by a massive subversion of We Will Not Use Stage Make Up in The Future.
 * In Double Vision, by Mary Higgins Clark, it's five years after Caroline's twin Lisa was murdered, and the killer's now after the survivor. It turned out that the killer actually intended to kill Caroline, unaware that she was a twin. When he returns to do the job properly, she manages to talk him out of it by convincingly lying to him that she really is Lisa. She explains that she had been The Unfavourite of their parents, so when he killed Caroline, she assumed the identity of her twin sister so their grief wouldn't be as profound.
 * The Expendable Spy, by Jack D. Hunter, is an American agent parachuted into Bavaria in World War II. When his contact is killed by an air raid, he assumes the man's identity, but then finds the contact was a Gestapo agent sent from Berlin to help organize the "Werwolf" underground. Worse, his new "boss" gets suspicious and sends his description off to Gestapo HQ asking for confirmation that this is the hotshot they sent. Unnervingly, the response to the description is not only, "Yes, that's him," but includes a photo. Of the American agent. So he's left wondering who in Gestapo Headquarters in Berlin is on his side.
 * In Miyuki Miyabe's All She Was Worth, detective Shunsuke Honma investigates the disappearance of his nephew's fiance Shoko Sekine, only to find that
 * Robert A. Heinlein's Double Star starts as Emergency Impersonation and turns into this at the end.
 * In Michael Slade's Ghoul, a woman kills another, then dresses in her clothes and a concealing scarf to move the body, tucked inside a large suitcase also belonging to the victim. As she destroys the body with a bath in Hollywood Acid, the investigators wouldn't even realize the victim had died at all, had the acid-bath not left a couple of undissolvable gallstones behind.
 * In Addie Pray, the basis for the movie Paper Moon,
 * One of the characters in Dread Empires Fall,  took over the identity of the real person whose name   using, and does a lot better with it than the original would have ever done.
 * Ten Soon from Mistborn
 * Brilliantly played with in that
 * At least twice in the NUMA Series:
 * In the Flashman novel Flash for Freedom, Flashman finds himself working on a slave ship and at one point, one of his fellow sailors, Beauchamp Comber, is killed, and as he dies, reveals he's actually a fervent abolitionist and part of a campaign to stop the slave trade. Since Comber has connections in America and had papers that Flashman could use to blackmail his father-in-law (who financed the slave ship), Flashman ends up taking on his identity in America. Flashman being what he is, ultimately ends up as a wanted criminal under the Comber identity (although this means that later on, he can return to America as Flashman, British war hero, without most people connecting him with Comber).
 * In Vanishing Acts, Andrew does this when he runs away with his child Delia. Their real names are Charles and Bethany, however they manage to acquire birth certificates and identification under the names Andrew and Cordelia Hopkins, who were a father and daughter that died in a car crash. However, this happens in the late 70s and early 80s.
 * The Great Impersonation by E. Phillips Oppenheim features an identical English gentleman and German spy. The mystery is whether the German killed the Englishman and is impersonating him, the Englishman is impersonating the German impersonating himself.
 * In the first (chronologically speaking) Drizzt Do'Urden novel, Alton DeVir disfigures himself to assume the identity of the very recently deceased (And horrifically maimed) master wizard known as the Faceless One after his family is murdered. After twenty years under this alias, he starts to wonder if at some point some student of his will kill him and take his place, leaving an endless succession of Faceless Ones at the academy, with nobody noticing (Or, given drow tendencies, caring).
 * The Sweet Valley books used this several times. One example is the Sweet Valley University book Very Bad Things. A young stalker's victim takes out a restraining order against her and transfers to Sweet Valley to escape her, so she has surgery to look like a girl from their old school (who died), assumes the dead girl's identity, and follows the guy to Sweet Valley.
 * In A Song of Ice and Fire  is forced to impersonate , who isn't really dead, but the people who want to marry her off can't find the real one, and think she's most likely dead by this point.
 * In The Walking Dead Rise of the Governor,
 * In Bioshock: Rapture it's revealed that

Live Action TV
"Creed Bratton: "Nobody steals from Creed Bratton. The last person that tried disappeared. His name? Creed Bratton.""
 * Columbo
 * At least three episode of Monk: "Mr. Monk and the Airplane", "Mr. Monk Goes to a Rock Concert", and "Mr. Monk Goes to Vegas".
 * Also the one with the assassin.
 * Jonathan Creek has had this happen a couple of times.
 * Sylar from Heroes did this after killing Zane Taylor, and a couple of other times.
 * This common tactic is turned against him at the end of season three when
 * Happens twice in the Pushing Daisies episode "Pigeon". First a criminal impersonates the man whose apartment he's just crashed a hijacked crop duster into. Then later, we discover that the same criminal has been part of a two-way impersonation: he promised to keep up his cellmate's letters to his sweetheart after the cellmate died, while in the meantime the sweetheart had also died, but made her daughter promise to keep up the letters.
 * Rex Buckland and Hannah Webster, the recurring villains from the first series of Charmed, were found to have killed and taken over the identities of the original Rex and Hannah in an attempt to get the Charmed Ones powers.
 * From The Office (USA)


 * The Last Detective has an episode called Lofty concerning the death of a deranged beggar who is found to keep all of his World War II documentation in a cigar box, leading the police to at first think he is a particular soldier. It turns out that the soldier (who was tall and thus the original Lofty) was killed in battle and his friend, a Classy Cat Burglar and Loveable Rogue before the war, had such serious PTSD that his mind was broken and he ended up as that beggar who everyone knew as Lofty. Just to note, the episode references the Ironic Nickname idea, in that someone nicknamed Lofty would actually be assumed to be short rather than otherwise.
 * On episode of M* A* S* H concerned a soldier who picked up the dog tags of his Jewish friend who was killed in battle and was going to be sent home, and he reveals his deception when wanting to confess to a priest. Ultimately, he is persuaded to give up his charade by being reminded of his friend's family who would never know the fate of their son.
 * The most famous example in Soap Opera is La Usurpadora (with its several versions and remakes), who combines this trope with Twin Switch, Separated At Birth, and Magical Nanny.
 * Another famous example was Argentinian Soap Opera Perla Negra. A young single mother named Eva decides to confront her Big Screwed Up Family and present them her baby son Charlie, born from a one-night stand with a Chick Magnet named Tomas. She gets ready to meet up with them and takes her best friend Perla with her as moral support... and then their car crashes. Eva dies in and Perla survives... but everyone thinks she's Eva; Perla, actually an orphan girl who was dropped off as a baby in the boarding school she and Eva attended, lets them think so and takes over Eva's identity, son and life mission so she can protect little Charlie, not knowing that she's going to learn about her own mysterious past as she fights the Alvarez Toledo clan for the kid's sake...
 * An episode of Law & Order: SVU involved a woman whose twin sister had been found murdered. It turned out that both girls had been mail-order brides, and the one they thought had been murdered had divorced her husband. The living woman then turned out to have assumed her sister's identity after the murder.
 * This is the defining characteristic of Don Draper, the main character in Mad Men. Born Dick Whitman, his mother was a prostitute who died early on and left his upbringing to his father and stepmother. He ran away to join the army, and was with a Lt. Donald Draper in the Korean War when the latter died. Immediately upon Draper's death, Whitman switched their dog tags, and assumed Donald Draper's identity (15 years as of the series' latest season).
 * Before he first appeared on Doctor Who, Captain Jack Harkness, a 51st-century ex-Time Agent, took his name and identity from a World War Two RAF American volunteer captain who was shot down when he was caught off guard in a training exercise in 1941. We don't find this out until the Torchwood series 1 episode "Captain Jack Harkness," in which.
 * On Lost, in late season 1 Kate planned to take the identity of a survivor who drowned on day 6. She never got to do it, though.
 * And does this with various people, most notably  and probably.
 * Back in the 60's, this was the whole plot of The Double Life of Henry Phyfe, a short-lived sitcom starring Red Buttons as the title character. I remember it chiefly for its theme song: "A foreign spy, A Red spy, The Number U-31, On his first day out, He's done in by a hit-and-run. 'Gotta find a man who looks just like U-31'--'WHO? ME?? Henry Phyfe'...If Henry Phyfe can keep his disguise a big mystery, This could be the greatest deception in history, With a little luck, he might even fool the enemy..."
 * Used in Medium where the impersonator has been using the dead man's secret, unpublished memoir to convince the dead man's wife that he's the dead man's spirit in a new body. It backfires when the impersonator doesn't "remember" "his" affair with his sister-in-law, which he obviously couldn't put into writing.
 * This might be a Take That to Ghost Whisperer's Jim/Sam arc, where the ghost of Melinda's husband Jim takes over the body of a guy named Sam and gets a nasty case of double-amnesia, with his body's medical history saying he's this person while his heart says he's another.
 * Word of God says Jim Profit would have been revealed to be this, had the show been renewed another season.
 * In the last season of Deep Space Nine, series villain Gul Dukat assumes the identity of the dead Bajoran Anjohl Tennan in order to exploit a past connection with Kai Winn.
 * Much earlier, in the episode "Duet"
 * Happened in an episode of White Collar. Neal accidentally goes undercover as a hit man, and in the end it turns out that.
 * Farscape: John impersonates a dead Peacekeeper officer in a bid to infiltrate a Peacekeeper base and save Aeryn's life. It... didn't go so well.
 * In an episode of Lewis,
 * Happened in The Closer episode "Living Proof", where what seems at first to be an unsuccessful attempt at Offing the Offspring turns out to have been a result of the sisters and father of a man killed in a massacre during The Balkan Wars finding out that the man's identity is being used by one of the apparent killers.
 * The basic premise Ringer, in which a woman takes the place of her dead twin. Except her twin isn't dead...
 * One episode of the remake of Randall and Hopkirk Deceased took the murder mystery variant to ridiculous extremes.
 * The original series had a man show up claiming to be Marty's spirit in another man's body... except since the real Marty's spirit is still hanging around haunting Jeff, Jeff knows right away he's a fake.
 * In The Sarah Connor Chronicles, Cameron assumed the identity of  after killing her, in an attempt to infiltrate John Connor's resistance. It is all but outright said that she failed, was captured, and reprogrammed by John. Several other terminators in the series have done the same thing, most notably the machines impersonating Greenway and Vick.
 * Not to mention Weaver.
 * A Coronation Street plot had John Stape impersonate his friend Colin Fishwick, who he'd murdered.
 * An episode of Red Cap had an army officer revealed as taking the identity of a dead childhood friend. The friend had committed suicide after being bullied by a teacher; he'd murdered the teacher in retaliation and been sentenced to juvenile court. On his release the father of the deceased helped him use his son's identity to join the British army, which as a convicted criminal he would normally be unable to join.
 * An interesting variation shows up in the Castle episode, "A Dance With Death": Odette, Upperclass Twit, hires a Body Double to do all her dirty work. Nobody knows they're actually two people. Odette dies in a freak train accident. Her Body Double takes over her life and all her cash, cause why the heck not?
 * This was the subject of an episode of The Incredible Hulk, of all things; David went to work for a young woman called Renee who was apparently being "Haunted" (the name of the episode) by the ghost of her twin sister who drowned when they were little girls. It turned out that Renee was the sister who'd drowned, and she had pretended to be "Renee" all these years because everyone had preferred her - but years of having to repress who she really was started to get to her...
 * The entire premise of the '60s TV show The Man Who Never Was - an American spy in Germany on the run from the enemy meets his exact double, a wealthy man. When the double is killed, the spy assumes his identity.

Real Life

 * During the Cold War, a Chinese American woman died in a shipwreck off China. The Chinese equivalent of the CIA had an agent who resembled her. They made her up to look like the dead woman and sent her into the US with the dead woman's passport. (Then she took a new identity in San Francisco.) Or So I Read.
 * Reino Hayhanen, the incompetent fellow-spy of Rudolf Abel, was an ethnic Finn from the Soviet Union. A certain man had been born in the US but grown up in Finland, eventually dying. Hayhanen was smuggled into Finland (truck with a false bottom), where he lived for two years as the dead man. He applied for and got the dead man's passport--since the dead man had been born in the US, this allowed Hayhanen to enter and live in the US as a citizen.
 * A slight twist: in WWII, a counterintelligence plot was conceived by the British, to feed the Germans false information regarding the invasion of Southern Europe. It revolved on making it appear that a plane, en route from Britain to their North African Army HQ, had crashed off the coast of Spain, and a messenger carrying a bag with some highly confidential papers floated ashore, drowned. To turn the corpse they obtained to that end into a "real" person that could stand scrutiny by enemy investigators (both in Spain, and possibly agents in Britain too), the person behind the plot, Captain Montagu, took on the identity of the messenger on several occasions.
 * A man named Jeffrey Howe was murdered and his body cut into pieces so his killers could take his identity and home (after he decided to stop them being The Thing That Would Not Leave).
 * On May 15, 1591, Tsarevich Dmitri Ivanovich, son of Ivan IV and half-brother of then-Tsar Fedor, died of a mysterious knife wound. Rumor initially had it that he was killed by Boris Godunov, father-in-law of Fedor and basically the ruler of Russia (Fedor had...problems), who wanted to become tsar after the childless tsar died. Anyway, the rumors go away, Fedor dies, and Boris becomes tsar. This goes well for him until around 1600, when in the midst of famine and a lot of social tension, a man in Poland claims to be Tsarevich Dmitri, gathers an army, and invades to kill the "usurper". Civil war ensues. Eventually, "Dmitri" takes the throne, but within a year he is killed by a conspiracy of boyars under Prince Vasili Shuiskii. Yet, rumors come out that "Tsar Dmitri" survived, the civil war restarts, and then another man claims to be "Tsar Dmitri." He is killed. Then ANOTHER man claims to be the now-thrice-murdered tsar. Then he is killed, Mikhail Romanov is made tsar, and the rest is history.
 * A common past technique for creating a fake identity in the U.S. was to learn the name and birth date of a child who died in infancy fifteen years earlier, then apply for a Social Security number under that name, as if the kid were getting his or her first summer job. Not used so much nowadays, as federal and local demographic databases can more easily synch up and spot the discrepancy.
 * One of the most famous real life cases is the story of Martin Guerre, which has inspired a number of fictional works. The real Guerre abandoned his family, and several years later, a man returned claiming to be him. Things went well for a while, but then that man was accused by his in-laws of being an impostor. In this case, things went wrong because the real Guerre was still alive and returned, and the fake one, actually named Arnaud du Thil, was sentenced to death.
 * The Borges Tom Castro story described under the Literature heading is a retelling of the Tichborne claimant incident. A man (real name Arthur Orton, AKA Tom Castro) claimed to be Sir Roger Tichborne, the disappeared heir to a wealthy and aristocratic English family.
 * Many people have been disqualified from military service over the years due to medical conditions, most of which aren't all that serious. One (quite illegal) way around this is to enlist under a false identity. The person you're trying to impersonate need not actually be dead, though if not, it certainly helps to get his assistance before attempting a stunt like that.
 * After the Russian Revolution and murder of the Romanov family, it was rumored that Grand Duchess Anastasia had somehow survived and/or escaped. For years, many people disputed this, and several claimed to be her, the most notorious impostor being Anna Anderson. After several DNA tests, the remains of all four Grand Duchesses had been accounted for, thereby proving that none escaped.
 * One major avenue of Medicare fraud in the US (and no doubt having variants in other countries) is to steal many beneficiary identities and run them through fake procedures in scam mills. Sometimes, the identities used are of dead people.
 * A man in Brooklyn put on a ruse as his own dead mother which looks like Black Comedy material. He fared pretty well too, until he decided to take out a lawsuit under her name.

Theater

 * The plot of Sizwe Banzi Is Dead is based on the eponymous character, living under apartheid in South Africa, switching places with a murdered man in order to be allowed to stay in Port Elizabeth.
 * And of course, the musical Martin Guerre. This version makes the real Martin and his imposter friends, and the imposter truly believes Martin is dead when he unknowingly assumes his identity, inlcuding falling in love with his wife. Of course, the trouble is, Martin's Not Quite Dead...

Videogames

 * A common strategy in the Ace Attorney series. In the second game,
 * Adrian Andrews never changes her identity, but models her hard-boiled, no-nonsense personality after her "mentor" Celeste Inpax as a coping mechanism after the latter commits suicide. When she reappears in the third game, she's reverted to what seems to be her genuine personality--upbeat and slightly bumbling.
 * Besides the above examples however,  takes the cake. He not only took over the identity of the person he had just killed, he  . Not to mention that he THEN.
 * This is inverted in the final case of Trials and Tribulations, where
 * Happens with  in Agarest Senki 2. Basically,
 * This is the modus operandi of a Snatcher.
 * In Final Fantasy VII, Cloud, rendered mentally unstable by experimentation and trauma, and with little self-esteem before that point, takes on the life story of his best friend, Zack. In the original, it was portrayed as Cloud finally snapping for good - in the remade scene in Crisis Core, it was portrayed as a conscious decision to live in Zack's honour. Either way, Cloud ends up genuinely believing that he was Zack, and the illusion comes apart in the most painful way possible later on.
 * Even if it did seem to be portrayed as a conscious decision in Crisis Core, you can still tell that Cloud was... unraveling.
 * Similarly, Setzer of Final Fantasy VI takes on the personality and reputation of his mentor, Daryl, after she dies. There's also Cyan, who writes letters claiming to be a woman's long-distance boyfriend after her real boyfriend dies.
 * At the beginning of The Last Express, the main character finds his murdered friend's body in a train carriage, and assumes his identity in order to track down the killer.
 * In Rondo of Swords, a prince is killed in the first chapter, and he requests that his Body Double (the main character) assume his identity, protect his sister, and save the kingdom. Depending on the path you take, the protagonist is either exposed and gains a new identity of his own or assumes the prince's life permanently.
 * The original Metal Gear Solid has more than one example:
 * The most obvious being
 * Throughout the entire mission
 * Probably the ultimate example of this is in The Legend of Zelda Majoras Mask, in which Link is taught a magical song that allows him to extract evil curses from the living and worldly sorrows from the dead to create magical masks. These masks allow him to shape shift into whoever they're from, so he ends up impersonating individuals of different species - the Goron hero Darmani, Zora guitarist Mikau, and a Deku Scrub boy who is heavily implied to be the
 * One of the victims in the Sierra game, Laura Bow: The Dagger of Amon Ra is actually impersonating a dead professor. Whom you also find as a skeleton.
 * Occurs at one point in Siren. The catch is that the game never shows you the scene where the character is murdered and replaced, so for a while you continue to play believing that the character in question is the original.
 * Countess Crey from City of Heroes is the "assume the identity of the murder victim" variation.
 * Occurs in Resident Evil: Code Veronica, though it's not intended as a ploy and.
 * "THE  FORM IS DEAD, INSECT."
 * The background story for "Fall From Heaven" features the Buggane, a type of demon who's preferred hunting style is to find a married couple when one of the people is away from home. It first impersonates the missing person all day, until it's in bed with the other spouse to kill them. When the distant spouse returns it does the same thing in reverse.
 * In Mass Effect 2, if you
 * In the Lair of the Shadow Broker DLC,
 * In Tales of Symphonia Dawn of the New World a single character impersonates two entirely different dead people at the same time, but the second case is unintentional. It's convoluted like that.
 * The original game gives us
 * Can happen in Team Fortress 2 occasionally, if a Spy backstabs the player in question then disguises as the same class as the person they just stabbed. By doing this they'll sometimes appear with their last victim's name, completing the ruse.
 * With the new Spy knife "Your Eternal Reward", this becomes the Spy's primary gameplay choice: The knife prevents the Spy from choosing a disguise. In return all backstabs become silent, make the body dissapear, and instantly disguise the Spy as the dead player.
 * A quest from House Hlaalu in Morrowind requires you to dress up as a dead person (depending on your gender) and retrieve some secret orders from House Redoran while wearing a helmet that the dead person always wore.
 * Prototype does it so thoroughly that even the impersonator is convinced. Learning who the original really was subverts Becoming the Mask.
 * Persona 2 has Nyarlathotep use this as a continued effort in Kick the Dog. It helps cement his status as an irredeemable Complete Monster of the highest caliber.
 * Seven Days A Sceptic: hijacks an early victim's identity.
 * Persona 2 has Nyarlathotep use this as a continued effort in Kick the Dog. It helps cement his status as an irredeemable Complete Monster of the highest caliber.
 * Seven Days A Sceptic: hijacks an early victim's identity.

Web Comics
"Torg: "I er.. Timetravelled from before you killed me! And I'm not looking forward to it!"
 * Torg from Sluggy Freelance employs this in a 2010 arc in which a group of supervillains assemble on an island to buy some kind of superweapon. Crushestro kills another villain called the Time Czar in front of all of them, and later on Torg disguises himself as him. Leading to this statement:

Everybody else: "..Time travel's confusing.""

Web Original

 * In The Gamers Alliance, takes the identity of Oswald Flynn who died in an earlier battle. He discards the false identity after he has gathered enough followers to take over Port Dunross from the Proninist Party.
 * Variation: In Survival of the Fittest version three, a character named Ken Lawson appears. It is revealed in his profile that he was Burton Harris from v2, except he was the real Burton Harris, and the one that died in the previous game was the real Ken Lawson, his best friend. Burton hadn't wanted to go on the school trip, and convinced Ken to go in his place. Due to the fact that they looked almost identical to each other, Ken was able to successfully pass himself off as Burton, only to be abducted and die in the game. Burton then took Ken's identity and moved across the country, trying to start up anti-SOTF movements in Ken's name. He never forgave himself for the identity-swap, not even when.

Western Animation

 * Happens with Principal Skinner in The Simpsons, who is actually Armin Tamzarian. There is an episode where "Skinner" is revealed to be an old war buddy of the real Sergeant Seymour Skinner (voiced by Martin Sheen, which is funny because he was in Apocalypse Now), and assumed the sergeant's identity to keep Skinner's mother from being alone after her real son was thought to have died in the war. When the real Skinner moves in, people start missing the "old" Skinner (even his mother, who preferred the easily domineered Armin over the naturally independent Seymour), culminating in Seymour being driven out of town and a judge giving Armin Skinner's identity. And it never comes up again.
 * Except in a Continuity Nod Lampshade Hanging of the show's rampant use of the Reset Button.
 * A few of them.
 * In the fifth season of Teenage Mutant Ninja Turtles (2003), it is revealed that Oroku Saki, the Shredder, had taken both identities from a man-turned-demon in ancient Japan.
 * On King of the Hill, Dale often uses the name Rusty Shackleford as an alias, claiming it was the name of a dead kid. Turns out the real Rusty Shackleford is very much alive, and wants Dale to stop using his name.
 * Gorillaz's Phase 3 guitarist Cyborg Noodle is a replacement for original-flavour Noodle, who vanished and was presumed dead at the end of Phase 2.
 * Zeta the robot from Batman Beyond and later The Zeta Project was programmed to be this way, but his A.I. eventually evolved into an actual personality and he decided he no longer wanted to continue killing and imitating his victims.
 * Also in The Simpsons when Krusty opens a Klown Kollege and Homer becomes a Krusty. Homer nearly kills a costume character at Krusty Burger and the mob starts trying to kill Homer for Krusty's debt.