A whole channel dedicated to the lives and crimes of some of the World's Most Evil Killers like Jeffrey Dahmer, Richard Ramirez, Dorothea Puente and more.

World's Most Evil Killers

S8, EP16 "Joe O'Reilly"

Less than 20 minutes after dropping her children off at school, Rachel O'Reilly is murdered.

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.

Britain's Most Evil Killers

S6, EP6 "Pawel Relowicz"

Pawel Relowicz rapes and kills 21-year-old Hull student Libby Squire in a case that made headlines around the UK.

Britain's Most Evil Killers

S6, EP3 "Jamie Reynolds"

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

World's Most Evil Killers

S8, EP7 "Richard Biegenwald"

Over a 25-year career of murder, Richard Biegenwald kills at least six people.

World's Most Evil Killers

S7, EP4 "Colin Campbell"

Thirty-two years later, a convicted killer serving life for manslaughter is found to be guilty of having committed a second murder.

World's Most Evil Killers

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.

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

S7, EP8 "Paul Runge"

A killer who found some of his victims through ads, the case of Paul Runge become prominent in the debate over the death penalty in Illinois.

World's Most Evil Prisoners

S1, EP5 "Osuna"

Covered in tattoos, his terrifying appearance makes Jaime Osuna a feared man in the U.S. prison system; awaiting trial, he begins practicing Satanism and attempts to kill a fellow inmate.

World's Most Evil Prisoners

S1, EP3 "Dennehy"

One of the UK's most infamous serial killers, Joanna Dennehy brutally stabbed three men to death.

World's Most Evil Prisoners

S1 "Nichols"

While on trial for rape, 33-year-old Brian Nichols goes on a violent rampage that results in three murders.

World's Most Evil Prisoners

S1, EP6 "Johnson"

Edward Johnson was sent to prison for the brutal murder of a female friend, but the violence didn't end there.

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

S7, EP8 "Paul Runge"

A killer who found some of his victims through ads, the case of Paul Runge become prominent in the debate over the death penalty in Illinois.

World's Most Evil Killers

S8, EP16 "Joe O'Reilly"

Less than 20 minutes after dropping her children off at school, Rachel O'Reilly is murdered.

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