Starting in 1987, the suburbs of Melbourne were terrorized by a rapist known as Mr Cruel whose attacks were so carefully planned that he left not a single trace of forensic evidence behind.

Sixteen-year-old Cassie Jo Stoddart was murdered by two of her high school classmates while house sitting in Bannock County, Idaho on September 22, 2006.

In 2000, Dr. Harold Frederick Shipman was convicted of murdering 15 of his patients, then he killed himself inside his prison cell just four years later.

In the 1960s, Eric Edgar Cooke murdered at least eight people in Perth and sometimes even dabbled in necrophilia — until he was finally caught.

Shawn Grate stalked northern Ohio between 2006 and 2016, slaughtering women after sexually assaulting them. He's now on death row, awaiting execution — thanks to one would-be victim's bravery.

In 1974, Randall Woodfield was drafted and quickly dropped by the Green Bay Packers. Just a few years later, he went on a brutal murder spree — killing up to 44 people.

On December 18, 1994, Alison Botha was abducted near her home in South Africa. By the end of the night, she had been raped, stabbed, and disemboweled — but she was still alive.

After Erin Caffey’s parents told her she couldn’t see her boyfriend anymore, she sought revenge — by having them all brutally murdered in their sleep.

Until his arrest in 2015, Peter Scully recorded himself torturing and sexually abusing young girls for thousands of dollars on his pay-per-view dark web site "No Limits Fun."

On February 17, 2014, 14-year-old Breck Bednar secretly met 18-year-old Lewis Daynes at his apartment in England. Bednar was found dead the next day.