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World's Most Evil Killers

S6, EP3 "Trimaan Harry Dhillon"

A killer attacks his ex-girlfriend in a jealous frenzy and commits a brutal murder after a campaign of harassment.

World's Most Evil Killers

S6, EP2 "Jamie Reynolds"

A 23-year-old killer murders 17-year-old former head girl Georgia Williams in 2013.

World's Most Evil Killers

S6, EP1 "Lee Ford"

Lee Ford kills his wife and four stepchildren in a cold-blooded murder spree over 24 hours in September 2000.

World's Most Evil Killers

S6, EP12 "Robert Pickton"

One of the most prolific serial killers in Canadian history is dubbed "The Pig Farmer Killer" by the media.

World's Most Evil Killers

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.

World's Most Evil Killers

S6, EP10 "Malcolm Green"

Malcolm Green is jailed for life for the brutal murder of a Cardiff prostitute; he kills again when he is released after 18 years.

World's Most Evil Killers

S6, EP9 "Mark Martin: The Sneinton Strangler"

The story of Mark Martin, who murdered three homeless women in his quest to become Nottingham's first serial killer.

World's Most Evil Killers

S6, EP8 "Geoffrey Evans & John Shaw"

Geoffrey Evans and his accomplice John Shaw hit headlines in 1976 after the murders of two women in Ireland.

World's Most Evil Killers

S2, EP10 "Richard Ramirez"

Born in El Paso, Texas, on February 29, 1960, Richard Ramirez was an American serial killer who over a two-year rampage raped and tortured more than 25 victims and murdered more than a dozen, most of them in their own homes.

World's Most Evil Killers

S2, EP9 "Rodney Alcala"

Rodney Alcala, who once appeared as a contestant on "The Dating Game," is sentenced to death over five murders committed in the '70s and later confesses to 30 more, but is believed to have killed up to 130 people.

World's Most Evil Killers

S2, EP8 "Dorothea Puente"

Dorothea Puente was a convicted serial killer who ran a boarding house in the 1980s; she cashed in the Social Security checks of the elderly and disabled boarders living in her house; many of them ended up dead and buried in the backyard.

Britain's Most Evil Killers

S2, EP7 "Tracie Andrews"

After Tracie Andrews' fiancé, Lee Harvey, is murdered in an apparent road-rage incident, she gives a heart-wrenching press conference, appealing to the public to help find her partner's killer.

Britain's Most Evil Killers

S2, EP5 "Roy Whiting"

A profile of child killer Roy Whiting, the convicted sex offender who abducted and murdered eight-year-old Sarah Payne.

Britain's Most Evil Killers

S2, EP9 "The Breaking Bad Killer"

The case of Stefano Brizzi, who murdered and consumed part of a police officer.

World's Most Evil Killers

S2, EP17 "Wolfgang Schmidt"

From October 1989 to April 1991, Wolfgang Schmidt murders five women and an infant; the area where some of the crimes take place leads to a second moniker, "the Beast of Beelitz."

World's Most Evil Killers

S2, EP16 "Horst Kroner"

The disturbing and horrifying case of Horst Kroener, a 53-year-old German man who was jailed in 2016 for brutally murdering his wife when she was asleep in their bed.

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