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Detectives and forensic experts recount the most extraordinary cold cases that were solved using the revolutionary technique of familial DNA testing.
S1, EP8 "Blood Bath"
A young woman's body is discovered close to her home in Bath, England; police eventually track down the perpetrator of the heinous attack.
S3, EP2 "The Greeley Rapist"
A seven-year-old girl is kidnapped and raped, but it takes almost 20 years for her assailant to be caught.
S2, EP9 "Montana Creek Murders"
When a woman is found dead in her home, detectives are left with more questions than answers.
S2, EP8 "Cold Case Twist"
A woman out for a walk is attacked and sexually assaulted by an unknown assailant; 14 years later, police trace a family tree using genetic genealogy and find the rapist.
S4, EP20 "Murder in Marietta"
The 1972 rape and murder of 9-year-old Debbie Lynn Randall is solved thanks to new science - 50 years later.
S4, EP19 "The Sadistic Killer"
Investigative genetic genealogy unmasks the sexual deviant who raped and killed Christina Castiglione in 1983.
S4, EP18 "Carrie's Courage"
A woman who was sexually assaulted at gunpoint in the 1980s contacts a genetic genealogist to solve her case.
S4, EP17 "Murder in Apartment 101"
In 2022, investigative genetic genealogy exposes a killer who stabbed a woman to death in her home in 1980.