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20 Of The Most Notorious Serial Killers The World Has Ever Seen

9. Andrei Chikatilo: The Butcher

Andrei, the Butcher of Rostov, said, "When I used my knife, it brought psychological relief. I know I have to be destroyed. I was a mistake of nature." He was responsible for sexually assaulting, killing and mutilating 53 women and children between 1978 and 1990 in Russia. After being captured in 1992, he was ordered to be killed by a firing squad in 1994.

10. Charles Edmund Cullen: The Angel Of Death

Cullen worked as a nurse in many hospitals but kept switching jobs as he was fired for suspicious behaviour from many of them. He confessed to murdering 40 elderly patients in New Jersey from 1984 to 2003. He did this by poisoning his patients to death with unprescribed medication. He stated that he wanted to relieve the patients from their suffering much like an angel would. Experts say he had more than 300 victims. Cullen has been imprisoned for life.

11. Patrick Wayne Kearney: The Trash Bag Killer

Also called the Trash Bag Killer, he operated between 1975 -1977. Kearney had a high IQ but once captured, he confessed to 32 murders of homosexual men. Kearney would dump their bodies along California highways and wrapped them in trash bags thus earning the name. He was convicted of 21 murders, but was sentenced to life because of his confession.

12. Dennis Raider: BTK Murderer

Between 1974 and 1991, Dennis Raider murdered 10 people in Wichita, Kansas. He even sent letters to police taunting them under his alias name BTK which stood for ‘Bind, Torture, Kill’. His technique was to stalk his victims before breaking into their homes, binding their limbs and finally strangling them. He disappeared in 1988, but remerged in around 2005 when he sent a floppy disc to the press which helped in tracing him. Rader confessed to his crimes and is serving 10 consecutive life sentences with the earliest release date possible on February 26, 2180.

13. John George Haigh: Acid Bath Murderer

John George Haigh was also known as the 'Acid Bath Murderer' and operated during the 1940s. He was convicted for the murders of 6 people, although he claimed to have killed 9. He was a professional conman, who lured wealthy people by charm and deceit, into to a warehouse where he shot them. Later he would dissolve their bodies in sulphuric acid then forge papers to sell their possessions and collect their life savings. He was sentenced to death and hanged in 1949.

14. Paul Knowles: The Casanova Killer

Also known as the Casanova Killer, Knowles used his charm into making victims believe him and later killed them. He killed a total of 18 people, although the count might be more. His victims included men, women and children. The man from Florida was eventually killed by an FBI agent in 1974 when he was trying to escape.

15. William Bonin: The Freeway Killer

Bonin was also known as the 'Freeway Killer'. Between 1979 and 1980, he raped, tortured and murdered at least 21 young men.  Bonin would dump their bodies along freeways in South California. After being convicted for 14 of his killings, he was executed by lethal injection in 1996. His sadistic side was still seen during his prison sentence where he corresponded with many of his victims' families about how their children reacted to his torture.

16. Aileen Wuornos: The Monster

Her story allowed Charlize Theron to win an Academy Award. She played Aileen in the 2003 movie, 'Monster'. While working as a prostitute, Aileen killed seven men in Florida for their money and confessed to shooting them, claiming all of them had either raped or attempted to rape her. She died in 1992 by lethal injection.

17. Jeffrey Dahmer: The Milwaukee Cannibal

Jeffrey Dahmer was responsible for dismembering 17 men and boys between 1978 and 1991. Dahmer also indulged in necrophilia and cooking body parts of his victim, then eating them. He was eventually caught after a prospective victim managed to overpower him. Dahmer was sentenced to 15 terms of life imprisonment in 1992. But he was beaten to death by a fellow prisoner at the Columbia Correctional Institution two years later.