Averted in the play. The uncle killed Cyril instead. As she isn't a murderess, Vera is allowed to live.
In three of the English-speaking movie adaptations: she is accused of murdering her sister's finacee, but reveals towards the end that it was her sister who killed him. And in one adaptation,all that happened was a child dying in her care and there is no reference to her lover at all. Only the Russian version faithfully keeps her original crime and character.
Agatha Christie seemed to be pretty fond of this trope for many of her female characters, mostly under the "deconstructing the Proper Lady and examining it more or less realistically" category, which was especially appropriate for the time period she wrote her novels in, when women were expected to be devoted to only their loved ones and have no other life of their own. This is deconstructedso very much. Vera would have to be her most prominent example because she not only deconstructs it; she stomps all over it and rips it completely to shreds.
In Roald Dahl's short story "Lamb to the Slaughter", Mary Maloney acts the perfect wife... until her husband announces that he's leaving her. She then lashes out with the frozen leg of lamb that was going to be that night's supper, killing him unintentionally. She is heartbroken, but as she is pregnant, she will not run the risk of being caught; she feeds the murder weapon to the police officers who come to investigate.
Elena from The Chronicles of Thomas Covenant takes this trope to the next level by having a disturbing romantic obsession over her biological father. Thanks to her, you will never look at the word 'beloved' the same way again.
In Greg Keyes' Elder Scrolls novel, The Infernal City, Slyr is so in love with Toel she attempts to Murder the Hypotenuse, who happens to be the protagonist. Naturally, things don't go according to plan, but she fits the trope to a T.
Hester Shaw from Phillip Reeve's Mortal Engines quartet. After she sees her boyfriend, Tom kissing Freya Rasmussen she betrays the city of Anchorage to Arkangel, just to get him back. She'd also do anything or kill anyone for him. Or to get him back.
The Lover in Porphyria's Lover by Robert Browning...the poem can be interpreted in a number of different ways, but the main gist of it is that he kills her so that he can make the moment last forever, and the poem closes with him clutching her corpse. Eep.
The vampiress Claudia shows signs of being both this and a tsundere for Louis. Besides her own anger, she's even willing to 'kill' Lestat so that they can be together. For certain reasons, she prefers to experience the physical side of the relationship vicariously.
Akasha, the Queen of the Damned, for Lestat. She sleeps for thousands of years until he (unintentionally) wakes her and the first thing she does is kill her husband and go on a killing spree, wiping out anyone who could mean Lestat harm. And that's only the tip of the iceberg.
Kirsten seems like a sweet, meek girl bound in servitude to Bede, the Guardian of the Sister of the North, with love and a dark spell. Her sister, who also loves him, is mysteriously missing - it must all be Bede's fault, right? Wrong. Kirsten is the true Guardian, a Clingy Jealous Girl to the extreme who with dark magic enslaved Bede to be her cover. She also threatens him into following her orders by holding the fate of her trapped-in-a-locket-by-magic sister Mariette (who he truly loves) over his head. Aww, isn't that sad?
Jin Yong: Ah Zi towards Xiao Feng fits this trope to a "T". She has the cute, innocent, Genki Girl looks... and the incredibly horrifying, sadistic personality. Guo Fu was also one towards Yang Guo. And then there's Zhou Zhiruo towards Zhang Wuji, among others.
Ryu Murakami's Audition. You know that movie by Takashi Miike? This is the book the movie is based on. And you better believe Asami Yamasaki is just as fucked up in the book as in the movie.
Tinkerbell. Yes, thatTinkerbell. 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."
Not necessarily, as the World Masterpiece Theater and the Disney version do keep the scene where she arranged for Wendy to be shot by the Lost Boys, as well as how she betrays the kids to Hook in exchange for him taking Wendy away.
In William Faulkner's short story A Rose for Emily, the eponymous Emily Grier fell in love with a man named Homer Barron. One day, he went in Emily's house and was never seen leaving. When Emily eventually passes away, her house is searched and it turns out she killed Homer with arsenic, dressed him in a suit, and kept the corpse on her bed.
More than one culprit that Mr. Sherlock Holmes and Dr. John Watson deal with turns out to be a yandere, and they're almost Always Male. Rodger Baskerville Jr. aka Jack Stapleton from The Hound of the Baskervilles is a good example: he abuses his wife and forced accomplice Beryl like you wouldn't believe, but when he forces her to pose as his sister and become a Honey Trap to attract Sir Henry, he goes Crazy Jealous Guy when Henry courts Beryl directly.
Also, Abe Slaney from The Adventure of the Dancing Men. He will do anything to force his ex-girlfriend Elsie Cubbitt (née Patrick) to return to the USA with him, going from harassment and threats written in a secret code that only he and his victim can decipher at first (the mentioned "dancing men"), to shooting her Nice Guy husband Hilton dead when he confronts him. He is nevertheless in despair when he realises this act led her to attempt suicide, and confesses to avoid getting her falsely charged for murder.
Jefferson Hope from A Study in Scarlet manages not only to be an Anti-Villain version of the trope (Enoch Drebber forces Hope's girlfriend Lucy to marry him and drove her to a Death by Despair, and Joseph Stangerson was a Jerk Ass who aided him by killing Lucy's dad), but also a Magnificent Bastard since he dies peacefully right after being caught, not even being tried..
Darien from Wolfbreed. First off, he is a werewolf and when first met, he already has an almost complete lack of morals along with a burning hatred of humanity. This partly stems from his Doomed Hometown, which he is responsible for by the way, Freudian Excuse. When he meets Maria, the first female werewolf he has seen since his all werewolf hometown bought it, he immediately falls in love with her only to find out she has been raised by humans, doesn't really know she is a werewolf, is a devout Christian as opposed to Darien's Flat Earth Atheist outlook and has already begun falling in love with with a man named Josef who is also falling in love with her. And to twist the knife a little deeper, Josef is a soldier in the army that wiped out Darien's hometown and killed his his family. Darien doesn't react too well to any of this.
Played straighter with Crown Prince Rabadash from The Horse And His Boy, willing to start a war with Archenland and Narnia without even the smallest excuse or challenge if it means he'll have Queen Susan the Gentle as his puppet-wife. He spectacularly fails.
Antoinette de Mauban in The Prisoner of Zenda. She's in love with the King's brother Michael, who wants to usurp the throne. However, if Michael becomes King, he'll have to marry a princess, which Antoinette doesn't want. There's no reason she can't stay as his mistress, she's in that role already, except that she wants to marry Michael, not share him. So, she does what any good Yandere would do: reveal Michael's plans to the one man who can stop them and tell him exactly how to break into the castle and free King Rudolf, all under the promise that Michael won't be killed. Even though Rassendyll promised this, there's no telling what Rudolf might do to his brother. So in short, she ruins Michael's dream of becoming King, taking the chance that he could be exiled or accidently killed all because she couldn't stand having another woman having him.
A Song of Ice and Fire: Lysa Arryn. A man named Littlefinger used her affection to convince her to murder her husband Jon and help spark a civil war. And when she believes that her niece Sansa is seducing him away from her, she threatens to throw the girl off a mountain to her death. (And ends thrown off instead.) Said niece was 13 years old and being sexually harrassed by Littlefinger, which would have been pretty clear to Lysa except, well...
Littlefinger's unrequited, long-running affection of Lysa's sister, Catelyn, places him quite firmly in the Yandere category. In fact he takes this trope to it's extreme, most notably by starting a devastating, continent-wide civil war just to discredit Catelyn's husband, Ned, and destroy her family, just because he couldn't have her to himself. Catelyn dying doesn't seem to have impacted him too much, as he's happily found a Replacement Goldfish in Sansa, Cat's daughter (and the aforementioned niece), and is now planning on bringing war to Westeros again to win the crown for Sansa and hopefully her love as well.
Lydia towards Ethan in Peter Moore's Caught In The Act.
In Death series: Indulgence In Death has a guy who killed a girl he was interested in a drunken fit of rage because she was not interested in him.
Visions In Death has a Twist Ending in which the psychic who had been helping Eve solve the case only did it because she wanted to make her murder of Annalisa Sommers look like John Blue murdered her. She was trying to get her ex-boyfriend back, who had hooked up with Sommers. She claims that she did it for love, but Eve refutes that claim, saying that she did it for power and control, and that love is just an excuse!
In The Dummy by Diane Hoh, Jaye Bishop learns that her supposed friend Caroline has been simultaneously cheating with Jaye's boyfriend Maguire and trying to kill Jaye. This isn't the first time Caroline has gone after someone else's boyfriend. In high school she murdered a classmate to get her boyfriend, then broke up with him because they started dating a month after Caroline committed the murder. Caroline figured he wasn't admirable boyfriend material if he was able to get over his dead ex so quickly.
The Odyssey has Calypso who, after offering her lover Odysseus a chance to stay with her on her island forever, tries to force him to stay on her island with her after he rejects her and tries to get back to his wife at Ithaca. She eventually lets him leave because Hermes told Calypso that Zeus said she had to let Odysseus go back to Ithaca.
Ashfur from Warrior Cats is a male version. After being rejected, he decided to pick off his former love's family members so that she could feel his pain.
In Les Misérables, Eponine is in love with Marius, but he hardly knows she exists, and he falls in love with Cosette. Unable to cope with this, Eponine leaves threatening messages on Cosette's house, convincing her father to flee, and when Cosette tries to inform Marius of her new address, Eponine steals the letter. Once Marius is convinced that Cosette has abandoned him, Eponine tells him that his friends are waiting for him at the barricade, and he goes there fully believing he will die. Eponine hoped that they would both die at the barricade and would be Together in Death, but she ends up taking a bullet for him, and dying in his arms. She still believes that he will die though, and it's only by some chance luck that Marius survives.
Phaidor in Gods Of Mars and Warlord Of Mars. Obsessed with John Carter, her attempt to kill Dejah Thoris and Thuvia results in all three of them becoming trapped in a temple for a year.
Briony Tallis from Atonement. She throws herself into a river to see if her crush will dive in to save her. She even falsely accuses him of raping her cousin after she catches him making love to her sister in the library, thinking he must be a sex maniac. It's strongly hinted that part of her motivation was jealousy that he was in love with her sister. Fortunately she's only thirteen and grows out of it somewhat.
Murasaki Shikibu'sThe Tale of Genji introduces Rokujo no Miyasudokoro, one of the titular character's older lovers. Said to be one of the first (and certainly one of the most well-known), Rokujo was extremely possessive towards Genji to the point that her hatred to other of his lovers manifested itself as an evil spirit which killed one or more of them.
Heathcliff from Wuthering Heights goes insane after he thinks Catherine doesn't love him, and this insanity pretty much drives his villainy for the remainder of the novel.