World's Most Evil Killers

In and around Gdansk, Poland from 1975 to 1983, Pawell Tuchlin attacked twenty women with a hammer. He brutally killed nine and sexually assaulted them all.

Danilo Restivo murdered two women nine years apart: sixteen-year-old Elisa Clapps in Italy and Heather Barnett in Bournemouth.

Dorothea Puente was a convicted serial killer who ran a boarding house in the 1980s.

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

In December 2015, Horst Kroner boarded a plane. He had brutally murdered his wife while she slept and was now headed to Thailand for easy sex.

From October 1989 to April 1991, Wolfgang Schmidt murders five women and an infant.

In 1999, California handyman Cary Staynor raped and murdered four young women. Obsessed with Big Foot, he became the monster in the woods.

Railway Killers John Duffy and David Mulcahy killed three women and raped many more across a four-year period in the early 1980s.

The Sunderland Strangler, Steven Grieveson, killed four teenage boys in the early 90s.

Serial killing partners Leonard Lake and Charles Ng murdered eleven people in California in the 1980s. They had a secret bunker where they raped and killed their prey.

In August 1985, the fourteen-month killing spree of Richard Ramirez, known as the "Night Stalker," was ended after he claimed at least thirteen lives.

Rodney Alcala appeared on "The Dating Game" and it led to his arrest. In 2011, he was found guilty of murdering six women and a twelve-year-old girl.

A look at Jack Unterweger, an Austrian serial killer who committed murder in several countries.

On December 1st, 1996, Tracie Andrews had stabbed her own fiance Lee Harvey to death and was trying to get away with murder.

On July 1st, 2000, eight-year-old Sarah Payne was snatched from the street in Littlehampton, West Sussex. She had been abducted and murdered by convicted paedophile Roy Whiting.

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.

In 2010, bodybuilder Raoul Moat shot his ex-girlfriend and her partner and went on the run and declared war on Northumbria police, vowing not to stop killing officers until he was dead.

In 2012, fame-hungry Mick Philpott killed six of his own children by setting fire to the family home as they slept upstairs.

In October 2012, Mark Bridger abducted and murdered five-year-old April Jones in Machynlleth, Wales. Evidence found on his laptop led to his conviction.

Stephen Port callously killed four young men between 2014 and 2015.