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An in-depth look at some of the world's most dangerous murderers.
S5, EP4 "William Bonin"
William Bonin is known to some as the 'Freeway Killer,' thought to have raped, tortured and murdered a minimum of twenty-one boys and young men before he was executed in 1996.
S7, EP16 "Heriberto Seda"
A killer who goaded police and media during his spree, Heriberto Seda claimed to kill based on his victims' star signs.
S8, EP17 "Colin Whelan"
When Mary Gough is found dead in her family home, her husband Colin Whelan appears shocked.
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, 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.