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An in-depth look at some of the world's most dangerous murderers.
S8, EP2 "John Eric Armstrong"
In 1999 and 2000, John Eric Armstrong cruises the streets of Detroit looking for sex workers.
S5, EP13 "Kenneth Regan & William Horncy"
In 2003, Kenneth Regan and William Horncy murdered a millionaire and his young family.
S6, EP11 "John Allen & Lee Malvo"
The story of the Beltway sniper attacks; John Allen and his teenage accomplice carry out a brutal series of shootings that kill ten people.
S6, EP12 "Robert Pickton"
One of the most prolific serial killers in Canadian history is dubbed "The Pig Farmer Killer" by the media.
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.
