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An in-depth look at some of the world's most dangerous murderers.
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, EP4 "Jerald Wingeart"
In January 1973, 20-year-old mother of one Dawn Magyar vanishes while on a shopping trip in Owosso, Michigan.
S7, EP3 "Lewis Daynes"
Exploring a case highlighting the many dangers of online grooming; on 17 February 2014, fourteen-year-old Breck Bednar was lured to a London flat before being killed by a fellow teenager.
S7, EP2 "John Cannan"
Experts look back on the crimes of John Cannan as he moved in and out of prison.
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.
