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World's Most Evil Killers
An in-depth look at some of the world's most dangerous murderers.
S5, EP6 "Billy Dunlop"
Billy Dunlop killed Julie Hogg in 1989 but was acquitted after two failed trials.
S8, EP3 "Steven Dean Gordon"
Steven Dean Gordon and Frank Cano murder at least four sex workers in California between 2012 and 2013.
S8, EP9 "Billy Mansfield Jr."
Billy Mansfield Jr. moved between Florida and Michigan, targeting vulnerable women and girls.
S6, EP18 "Velma Barfield"
The first woman executed by lethal injection after taking six lives.
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.