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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.

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.

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World's Most Evil Killers

S8, EP10 "Wayne Adam Ford"

Wayne Adam Ford is an American serial killer who strangled and dismembered three of his victims.

World's Most Evil Killers

S8, EP17 "Colin Whelan"

When Mary Gough is found dead in her family home, her husband Colin Whelan appears shocked.

World's Most Evil Killers

S8, EP9 "Billy Mansfield Jr."

Billy Mansfield Jr. moved between Florida and Michigan, targeting vulnerable women and girls.

World's Most Evil Killers

S7, EP8 "Adrian Prout"

A master manipulator is accused of the murder of his wife, and is eventually caught out by a polygraph test - and his own fiancée.

World's Most Evil Killers

S8, EP20 "Eric Locke"

Dublin man Eric Locke refuses to accept it when Sonia Blount, a mother of one, ends their relationship.

World's Most Evil Killers

S8, EP19 "Catherine Nevin"

Catherine Nevin reports a break-in and violent attack at her pub, which leaves her husband dead.

World's Most Evil Killers

S8, EP18 "Charlotte and Linda Mulhall"

In March 2005, the gardaí recover human body parts from the Royal Canal in Dublin.

World's Most Evil Killers

S8, EP17 "Colin Whelan"

When Mary Gough is found dead in her family home, her husband Colin Whelan appears shocked.

An in-depth look at some of the world's most dangerous murderers.
Starring: Andy Gatenby, Christopher Kouros, Elizabeth Yardley, Gareth Lawrence, Geoffrey Osborne, Geoffrey Wansell, Harold Schechter, Helen Morrison, Matthew James Morrison, Roberto Vivancos, Ross Huguet, Shabnam Chaudhri, Stuart Hamilton, Tom Bonington, Yanick Ghanty
Original Air Date: Aug 10, 2017
Genres: DocuseriesTV Series
Rating: MA 15+
Playback: HD
8 seasons available on demand
Available on

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World's Most Evil Killers

An in-depth look at some of the world's most dangerous murderers.

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