Bonnie and Clyde. The mere names bring to mind a pair of young lovers on the lam from the cops.

Bonnie and Clyde have been glorified in the media since they first swept into public notice, but the fact of the matter is, in addition to their robberies, they were a duo of serial killers, who murdered at least 13 people.

By doing so, they joined a very small population – serial killer couples.

1. Gwendolyn Graham and Catherine May Wood

In 1987, the Alpine Manor Nursing Home in Walker, Michigan became host to a series of horrific crimes, perpetrated by nurse aides Gwendolyn Graham and Catherine May Wood. The pair were engaged in a torrid sexual affair that included bouts of erotic asphyxiation, but soon they wanted more. The pair began tossing about the idea of murder as a sexual activity and settled on their first victim.

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In January 1987, Graham entered the bedroom of a woman suffering from Alzheimer's disease and smothered her with a washcloth while Wood acted as her lookout. By the end of the year, the women had together killed five victims, all of whom had Alzheimer's but couldn't fight back. They would choose them according to their first initials, trying to use them to spell the word "MURDER."

Wood and Graham were caught one year later when Wood confessed to police in revenge for Graham leaving her for another woman. Graham was given five life sentences, and Wood was given 20 years each for one count of second-degree murder and one count of conspiracy to commit second-degree murder The pair's crimes were the inspiration for the sisters Miranda and Bridget Jane in American Horror Story: Roanoke.

2. Myra Hindley and Ian Brady: The Moors Murders

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The years between 1963 and 1965 were fraught ones for parents in and around Manchester, England. Children were going missing, only to be discovered in shallow graves, their bodies beaten and sexually assaulted. The perpetrators of these horrific crimes were Ian Brady and Myra Hindley, a pair of young psychopaths who showed no remorse for their crimes once they were discovered and put on trial.

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At the time of the murders, Ian Brady was a 27-year-old stock clerk, and his girlfriend, Myra Hindley, a 23-year-old typist who bleached her hair blonde. The pair were obsessed with Nazism and books on torture and assault, so they decided to take their obsession one step further. During their three-year spree, they abducted, sexually assaulted, and killed five children aged 10-17, both boys and girls. Hindley would drive around in her van, Brady riding his motorcycle behind her. She would stop and offer the victim a ride, and when he or she was in the car, she would ask them to find her missing glove. She would then drive them to the moors where Brady would sexually assault them and they would kill them.

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The pair were caught when Hindley's brother-in-law, David Smith, helped them rob a boy, Edward Evans, 17, only for Brady to kill him. Scared stiff, Smith helped the couple dispose of the body, then quickly called the cops. Both Brady and Hindley were sentenced to life – Brady to a psychiatric institution, and Hindley to prison. Both died in their respective institutions of old age.

3. David John Birnie and Catherine Margaret Birnie: The Moorhouse Murders

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For a period of five weeks in 1986, a series of women began disappearing in the area around Perth, Australia. The killers were a local couple, David and Catherine Birnie, who had both been known to be bad news from the time they were children. David Birnie grew up in an extremely poor, extremely dysfunctional family. His parents were known for their promiscuity and alcoholism, and rumors abounded that the family of five children engaged in incest.

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When he met Catherine Birnie (nee Harrison) when they were 12, it was love at first sight, and although they never formally married, she got back with him the moment he left jail for his many and numerous crimes, which ranged from misdemeanors to felonies.

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During five weeks in 1986, the Birnies brutally killed four women and attempted to kill a fifth before they were caught. The pair would cruise around the highway looking for women, and when they saw one on the road, they would lure her into their car, where David would menace her with a knife, tie her up, and then rape her repeatedly before stabbing her to death,

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The pair were only caught when they abducted 17-year-old Kate Moir at knife-point. When David went to work the next day, Catherine forgot to tie her to the bed as she went out to do a drug deal. Moir jumped out the window and ran to a nearby shop, where she called the police. The Moirs were both sentenced to four life sentences each.

4. Fred and Rosemary West

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Have there been a pair of murderers as deranged and twisted as Fred and Rosemary West? Each half of the husband and wife pair was horrific on their own, but together, they were completely nightmarish. Fred West was born to an extremely dysfunctional family. His father was strict, his mother overprotective, and he thought that sexual abuse and bestiality were normal. In fact, he abused his own younger sister until she got pregnant.

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Rosemary West (nee Letts) also grew up under horrific circumstances, with her father abusing her all through her childhood and even after she married Fred and had eight children. Fred sometimes watched, and even encouraged Rosemary to prostitute herself, which she did.

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Their house in Gloucester was a scene of horrors, with West abusing his own children to the point where he gave them syphilis, and Rosemary being abused by her own father and prostituting herself to other men while West watched. Between the late '60s and early '70s, the pair raped and murdered 10 girls and women, both Fred and Rosemary equal participants in both horrific acts. The pair also killed separately, and Fred is known to have killed three people on his own while Rosemary killed two, one of them being Fred's teenaged stepdaughter, Charmaine.

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The pair were only caught in 1992, after Fred was arrested for repeatedly raping his 13-year-old daughter. During this time, the police began looking into the disappearance of the West's 16-year-old daughter, Heather, who the Wests had said ran away. When Heather's body was found in the West's backyard, the victim of her monstrous parents, police also discovered the bodies of the other victims, and both monsters were given life without the possibility of parole.

5.) Jeremy Steinke and Jasmine Richardson

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In 2006, after 12-year-old Jasmine Richardson's parents forbid her from seeing 23-year-old boyfriend Jeremy Steinke, she asked him to murder them in retaliation. Steinke, believing he was a 300-year-old werewolf (and apparently above the law), obliged and on Jasmine's request, stabbed her father, Marc Richardson, 42, her mother, Debra, 48, and younger brother, Jacob, 8, to death in their home. The pair were arrested the day following the murders. Steinke is currently serving 3 consecutive life sentences, while Richardson only got 10 years.