In May 1990, convicted killer Jack Unterweger was freed from prison. He became a celebrated writer and a prison reform advocate in Austria until it was discovered that he killed nine more women.
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Steven Dean Gordon and Frank Cano murdered at least four sex workers in California between 2012 and 2013.
Once a respected local doctor in Hyde, Manchester, Dr. Harold Shipman became better known as Dr. Death. In January 2000, Shipman was found guilty of murder and sentenced to life imprisonment.
Less than 20 minutes after dropping her children off at school, Rachel O'Reilly was murdered.
Jorge Torrez was a prolific predator capable of carrying out heinous and horrific acts.
Robert Black was a Scottish serial killer and paedophile who was convicted of the kidnap, rape, sexual assault and murder of four girls aged between five and eleven.
The story of the serial killer who snatched away the lives of eight women during a decade-long killing spree.
The story of Malcolm Green, who was jailed for life for murder, only to kill again when he was released.
Robert Ben Rhoades, aka the Truck Stop Killer, raped and tortured women in the back of his truck for over a decade from the mid-70s.
Sante and her 23-year-old son Kenny Kimes were a murderous duo who killed three people in the late 90s, including an 82-year-old woman.
Diane Downs shot her three children, killing her seven-year-old daughter Cheryl and wounding her other two children.
In Cumbria, 2010 taxi driver Derek Bird took his gun and, in less than 24 hours, shot dead 12 people and injured 11 more. The callous killer only stopped when he had run out of ammunition, finally turning the gun on himself.
Serial killer John Cooper, known as The Bullseye Killer, killed four people between 1983 and 1996. He was given four life sentences.
Jane Longhurst vanished after making a plan to go swimming with her friend's boyfriend.
Robert Berdella was an American serial killer, known as The Kansas City Butcher, who was responsible for drugging, raping, torturing and murdering six young men.
By the age of nineteen, Polish schoolboy Karol Kot, aka the Vampire of Krokow, had killed two people. He tried to kill many more in arson and poison attempts and was executed at the age of twenty-one.
For one week in 2016, Stefano Brizzi stored the body of a policeman in his flat in central London. Taking inspiration from the TV show "Breaking Bad," he tried to dissolve the body in his bath tub.
An investigation into the woman who was driven into a jealous rage and stabbed her sister to death while her children slept upstairs.
Billy Mansfield Jr. moved between Florida and Michigan, targeting vulnerable women and girls.
30-year-old Trevor Hardy, known as The Beast of Manchester, killed three teenage girls in a series of brutal attacks in the mid to late 1970s and was one of Britain's longest-serving prisoners.
Rapist Arthur Hutchinson escaped from police custody in October 1983. Whilst on the run, he broke into the Laitners' house in Dore, Yorkshire and murdered three family members.
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