
Detectives and forensic experts recount the most extraordinary cold cases that were solved using the revolutionary technique of familial DNA testing.
A beloved local teacher is brutally attacked in her Pennsylvania home; after 27 years, dedicated investigators trace her killer.
In 1979 two young boys find their mother's dead body in the living room; how the investigators track down the killer with no solid leads.
In 1976 a woman was left for dead in her home in southern California; despite a major manhunt, the violent killer avoided detection for over four decades.
A lorry driver is found dead behind the wheel in Camberley, England; police use a revolutionary technique of familial DNA analysis.