World's Most Evil Killers

The chilling story of the serial killer who worked as a nurse in Texas, where she killed many children and infants by injecting them with drugs.

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

She became the first woman to be executed by lethal injection after taking six lives. What drove her to commit these callous murders?

The story of the Baton Rouge Serial Killer, known for murdering seven women in the area and sentenced to death for his chilling crimes.

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

The story of a terrifying killer who snatched away the lives of four victims before being caught while trying to claim his fifth.

The story of a killer so evil that not even her own son could escape her clutches. She became the first woman to be executed in Florida since 1848.

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

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

The story of the Beltway sniper attacks. John Allen and his teenage accomplice carried out the brutal series of shootings that killed ten.

The story of Malcolm Green, who was jailed for life for the brutal murder of a Cardiff prostitute, only to kill again when he was released after 18 years.

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

The story of serial killer Geoffrey Evans and his accomplice John Shaw, who hit headlines in 1976 after the murders of two women in Ireland.

The story of the killer who took four lives during a chilling two-day killing spree in 2004 after being inspired by horror films.

The story of 27-year-old Pawel Relowicz, who raped and killed 21-year-old Hull student Libby Squire in a case that made headlines around the UK.

Sarah Williams and Katrina Walsh: the story of two friends who carried out the evil, jealousy-fuelled murder of Sadie Hartley.

Stuart Campbell was convicted of the murder of his 15-year-old niece in 2002, even though her body has never been found.

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

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

The chilling story of Lee Ford, who killed his wife and four stepchildren in a cold-blooded murder spree over 24 hours in September 2000.