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World's Most Evil Killers
An in-depth look at some of the world's most dangerous murderers.
S7, EP8 "Adrian Prout"
A master manipulator is accused of the murder of his wife, and is eventually caught out by a polygraph test - and his own fiancée.
S8, EP1 "Lester Jones"
In 2007, single mother of three Paige Birgfeld goes missing.
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.
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.