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An in-depth look at some of the world's most dangerous murderers.
S5, EP5 "Lonnie David Franklin"
Lonnie David Franklin Jr. is better known by the nickname Grim Sleeper.
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.
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.
S8, EP18 "Charlotte and Linda Mulhall"
In March 2005, the gardaí recover human body parts from the Royal Canal in Dublin.
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.
