Dubbed the Vampire Rapist, John Brennan Crutchley was a suspected serial killer who drank the blood of one of his kidnapping victims.
In March 2005, body parts were found in an Irish canal that would lead to the arrest and conviction of the infamous Scissor Sisters.
Steven Judy was convicted and executed for the heinous murders of a young mother and her children, and was suspected of many other killings.
The case of the Beast of Buckland is one of unsolved crime and a miscarriage of justice that allowed a killer to get away with murder.
The last person executed in modern Russia, serial killer Sergey Golovkin tortured and killed young boys from the outskirts of Moscow.
In November 2003, the disappearance of Charlene Downes exposed endemic sexual exploitation of young girls in the city of Blackpool.
Joe Clark, the Baraboo Bonebreaker abducted younger boys and subjected them to torture that led to the death of one of his victims.
As the lead singer of Welsh rock band the Lostprophets, Ian Watkins had legions of fans, but few could know he was a prolific child abuser.
When Vicki Wegerle was murdered in September 1986, it took almost twenty years to bring her killer, the BTK Strangler to justice.
Paul Bernardo and Karla Homolka, known as the Ken and Barbie killers, carried out the rapes and murders of young girls.
