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An in-depth look at the life and crimes of William Devin Howell who was found guilty of the murders of seven different women.
Examining the crimes of Glen McCurley, who in 1974 abducted 17-year-old Carla Walker from a bowling alley car park and killed her before leaving her body in a ditch.
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.
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.