25 Of the most evil serial killers ever! – How can people be this messed up?? (+Photos & Video)

15. Arthur Shawcross

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Known as the Genesee River Killer, Shawcross first killed in 1972, sexually assaulting and murdering a 10-year-old boy after luring him into a wooded area in Watertown, New York then raped and killed eight-year-old girl, for which he was captured and convicted of manslaughter. Serving 14 years imprisonment he was released in 1988 and went onto brutally kill 12 female prostitutes aged between 22 and 59 years old. Eventually captured at the scene of his last murder, Shawcross confessed to all 12 murders and was sentenced to 250 years imprisonment, though died in prison of cardiac arrest in 2008.