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An in-depth look at the life and crimes of Michael Bruce Ross who was executed in 2005 after raping and murdering women across Connecticut and New York.
An in-depth look at the life and crimes of William Devin Howell who was found guilty of the murders of seven different women.
A profile of serial killer Donald Henry Gaskins who stabbed, shot, drowned and poisoned more than a dozen people in South Carolina in the 1970s.
Returning for series 9, World's Most Evil Killers will examine some of the most dangerous and prolific murderers in the world, uncovering what drove them to commit such heinous crimes.