The chilling story of Lee Ford, who killed his wife and four stepchildren in a cold-blooded murder spree over 24 hours in September 2000.

The story of Sarah Williams and Katrina Walsh, friends who carried out the evil, jealousy-fuelled murder of businesswoman Sadie Hartley.

The story of serial killer Geoffrey Evans and his accomplice John Shaw, who hit headlines in 1976 after the murders of two women in Ireland.

The chilling story of Mark Martin, who murdered three homeless women in his quest to become Nottingham's first serial killer.

The story of 27-year-old Pawel Relowicz, who raped and killed 21-year-old Hull student Libby Squire in a case that made headlines around the UK.

The story of Malcolm Green, who was jailed for life for the brutal murder of a Cardiff prostitute, only to kill again when he was released after 18 years.

The story of Stuart Campbell, who was convicted of the murder of his 15-year-old niece in 2002, even though her body has never been found.

The story of Trimaan Harry Dhillon, who attacked his ex-girlfriend in a jealous frenzy and committed a brutal murder after a campaign of harassment.

The story of Jamie Reynolds, the 23-year-old killer who murdered 17-year-old former head girl Georgia Williams in 2013.

British killer Daniel Gonzalez, also known as the Freddy Krueger Killer, who took four lives during a chilling two-day murder spree in 2004 after being inspired by horror films. He eventually commited suicide in his room in Broadmoor Hospital.