World's Most Evil Killers

Steve Wright killed five women over a six-week period in the winter of 2006 without motive or explanation.

Peter Sutcliffe, also known as The Yorkshire Ripper, was convicted of killing 13 women and attempting to murder seven others.

Ian Huntley abducted two 10-year-old schoolgirls, Holly Wells and Jessica Chapman, murdered them and tried to burn the bodies.

Fred and Rose West raped, tortured and killed young women in their house of horrors, including their own daughter.

Levi Bellfield was arrested for killing two young women and an attempted murder. While in prison, he was convicted of a third murder that went unsolved for years.

Joanna Dennehy violently stabbed three men to death in March 2013. She killed for her own entertainment and has been diagnosed as a psychotic sadomasochist.

Stephen Griffiths, the self-proclaimed Crossbow Cannibal, had always fantasized about murder. In 2009, he acted on his murderous instincts and killed three women.

Dennis Nilsen killed at least 12 men in the late 70s and early 80s in Muswell Hill, London.

Stuart Hazell sexually assaulted and murdered Tia, his partner's 12-year-old granddaughter.

It is widely believed that Peter Tobin is the 1960s Scottish serial killer known as Bible John.

In 1987, Michael Ryan went on a killing spree in the quiet market town of Hungerford in Berkshire, England, before turning the gun on himself.

Beverley Allitt killed four children and attempted to murder nine more while working as a nurse at Grantham and Kesteven Hospital in Lincolnshire, England, in 1991.

John Wayne Gacy murdered 33 boys and young men during a six-year period in the 1970s. He hid the bodies of his victims in the walls of his suburban home.

Jeffrey Dahmer was one of the most notorious killers in the world. For 13 years he raped, murdered and ate his young male victims -- 17 of them in total.

Ed Gein murdered two women in the 1950s. He was also a body snatcher and fashioned items out of bones and skin.

Joachim Kroll murdered at least 13 people during a span of over 20 years.

Volker Eckert, a German truck driver, strangled and killed as many as 19 women across Europe in a murderous career that lasted over 30 years.

Marc Dutroux kidnapped, tortured and sexually abused six girls between 1995 and 1996, and he murdered four of them.

Fritz Honka killed four prostitutes in Hamburg, Germany, during the early 70s.

Thierry Paulin murdered 21 elderly women during the 1980s. He lived a lavish lifestyle, funded by the money stolen from his victims.