
Examining some of the most dangerous and prolific murderers in the UK and worldwide.

Pawel Relowicz rapes and kills 21-year-old Hull student Libby Squire in a case that made headlines around the UK.

The story of a killer who took four lives during a chilling two-day killing spree in 2004 after being inspired by horror films.

Geoffrey Evans and his accomplice John Shaw hit headlines in 1976 after the murders of two women in Ireland.

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