Documentary profiling Chicago killer John Wayne Gacy, who was well-liked by his local community, until it emerged he had ended the lives of 33 men in the 1970s.

John Allen and Lee Malvo: The story of the Beltway sniper attacks. John Allen and his teenage accomplice carried out the brutal series of shootings that killed 10.

Sunset Strip Killers: The story of two killers who targeted young girls and sex workers for their own twisted pleasure. Descriptions of sexual violence and child abuse.

A profile of Derrick Todd Lee, who murdered seven women in the Baton Rouge area of Louisiana, and was sentenced to death for his chilling crimes.

A profile of the serial killer who took the lives of six victims in one month, known to some as The Vampire Killer due to his penchant for cannibalism.

A look at the lives and crimes of a duo of cousins who, together, took the lives of 10 girls and women aged between 12 and 28.

The Shoe Fetish Killer: The crimes of Jerry Brudos, whose disturbing shoe fetish played a part in the gruesome murders he carried out on four young women.

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

A profile of the serial killer who found himself at the center of New York's biggest manhunt after a vicious shooting spree that left six dead.

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 Alaska serial killer Robert Hansen who murdered at least seventeen women during a spree that lasted for more than a decade.

A chilling profile of the serial killer Todd Christopher Kohlhepp, who claimed the lives of at least seven innocent people between 2003 and 2016.

An investigation into the murderous mother-and-son duo, who killed their elderly landlady in a greed-fuelled ploy.

Freeway Killer: The story of the savage serial killer who took the lives of over 21 victims and left their bodies strewn across freeways in California.

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

Trash Bag Killer: The story of one of the most prolific serial killers in America, with a victim list of at least 25 - the youngest aged just five.

The Molalla Forest Killer: The story of the brutal killer who targeted women on the street and dumped their bodies in the forest.

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

A man who terrorized Phoenix in an extensive year-long crime spree, committing nine murders with no apparent motive.

A profile of the murderer known to some as the Riverside Prostitute Killer, who sits on death row after being convicted for the slaying of 12 women.

A profile of the triple-murderer who killed his ex-girlfriend, her nine-year-old daughter and another man in a brutal attack.

A profile of the serial killer who took the lives of four innocent women before being handed the death sentence.

The story of Judy Buenoano, the first woman in Florida to die in the electric chair. She was a killer so evil that her own son became one of her victims.

Serial killer Gary Ray Bowles, who took the lives of six men in 1994, and became known as the I-95 Killer, as most of his victims lived close to the Interstate 95 highway.

The story of Velma Barfield, the first woman to be executed by lethal injection after taking six lives.