World's Most Evil Killers

The story of the 23-year-old killer who murdered 17-year-old former head girl Georgia Williams in 2013.

The story of the killer who attacked his ex-girlfriend in a jealous frenzy and committed a brutal murder.

Stuart Campbell was convicted of the murder of his 15-year-old niece in 2002.

The story of two friends who carried out the evil, jealousy-fuelled murder of Sadie Hartley.

The story of 27-year-old Pawel Relowicz, who raped and killed 21-year-old Hull student Libby Squire.

The story of the killer who took four lives during a killing spree after being inspired by horror films.

The story of serial killer Geoffrey Evans and his accomplice John Shaw, who hit headlines in 1976.

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

The story of Malcolm Green, who was jailed for life for murder, only to kill again when he was released.

John Allen and his teenage accomplice carried out the brutal series of shootings that killed ten.

The story of one of the most prolific serial killers in Canadian history, "The Pig Farmer Killer."

The story of the serial killer who snatched away the lives of eight women during a decade-long killing spree.

The story of a killer so evil that not even her own son could escape her clutches.

The story of a terrifying killer who snatched away the lives of four victims.

The story of the I-95 killer, who brutally killed six men in 1994 before being executed three years later.

The story of the Baton Rouge Serial Killer, known for murdering seven women and sentenced to death.

Velma Barfield became the first woman to be executed by lethal injection after taking six lives.

The story of the serial killer who took the lives of eleven people during a decade-long murder campaign.

The story of the serial killer who worked as a nurse in Texas, where she killed many children and infants.