Overview: DNA left on a cigarette butt leads investigators to the brutal killer of 84 year-old gun enthusiast Kenneth spearman
Overview: Police painstakingly trawl through hours of cctv footage, location data and forensic evidence to find the brutal killer of a heavily pregnant woman
Overview: An unlikely informant holds the key to justice when 59 year old antique dealer michael Griffiths is targeted and brutally killed in his home
Overview: A computer at vogue magazine held the key to identifying julie clayton, an ex-cult member who'd been assaulted and murdered upon leaving
Overview: It took 18 years to identify melissa halstead after her torso was found in a Rotterdam canal. But detectives never stopped working to catch her killer.
Overview: A seemingly ordinary family man is the prime suspect when his wife, three young children and mother-in-law are brutally killed after church.
Overview: The FBI investigates when a seemingly perfect husband flees the United States following the murder of his wife and three children
Overview: Two women are killed in the 70s and their cases go cold for over 30 years, until a chilling link between the two emerges.
Overview: Detectives look back on the case of Elijah Butler,murdered four days after he married his wife-by her long-term stalker.
Overview: Detectives reflect on how they gathered evidence to charge Melanie McGuire with murder when her husband's remains were found in multiple suitcases