Exhibiting cruelty, callousness, and viciousness beyond any human understanding, Richard Ramirez terrorized Los Angeles with his spate of home invasions.

Serial killer Edmund Kemper killed six women in California and several members of his family.

Examining the murderer who appeared on a dating game show in the midst of a killing spree that may have claimed as many as 130 victims.

The chilling case of a Hong Kong kleptomaniac and a Vietnam veteran who committed a series of horrific murders from their cabin in California.

The case of 'The Pink Giant', Wolfgang Schmidt, a transgender German serial killer who brutally murdered five women and an infant.

The story of the Austrian serial killer Jack Unterweger, who was heralded as an example of successful rehabilitation, only for him to kill again.

An examination of the Polish serial killer, who came to be known as "The Scorpion" after murdering nine women and attacking eleven others.

Also known as the Yosemite Park Killer, Cary Stayner murdered four women in 1999 before his capture. Were his actions the result of a tragic childhood?

The disturbing case of 53-year-old German Horst Kroener, who was jailed in 2016 for murdering his Filipina wife in her sleep.

The story of the "Death House Landlady", who took in elderly and disabled tenants, only to murder them for their social security paychecks