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World's Most Evil Killers
An in-depth look at some of the world's most dangerous murderers.
S7, EP7 "David Bieber"
A fugitive from the United States murders one British police officer and tries to kill two more, sparking a nationwide search.
S8, EP9 "Billy Mansfield Jr."
Billy Mansfield Jr. moved between Florida and Michigan, targeting vulnerable women and girls.
S7, EP6 "Nathan Matthews"
A family's worst nightmare occurs when 16-year-old Becky Watts goes missing, and is found dead days later, murdered by her own stepbrother.
S7, EP17 "Mark Goudeau"
A man who terrorized Phoenix in an extensive year-long crime spree, committing nine murders with no apparent motive.
S8, EP20 "Eric Locke"
Dublin man Eric Locke refuses to accept it when Sonia Blount, a mother of one, ends their relationship.
S8, EP19 "Catherine Nevin"
Catherine Nevin reports a break-in and violent attack at her pub, which leaves her husband dead.
S8, EP18 "Charlotte and Linda Mulhall"
In March 2005, the gardaí recover human body parts from the Royal Canal in Dublin.
S8, EP17 "Colin Whelan"
When Mary Gough is found dead in her family home, her husband Colin Whelan appears shocked.