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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, EP6 "Unrighteous Act"
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.
S1, EP14 "The Clearfield Rapist"
With the help of familial DNA, detectives are able to track down and capture a serial rapist.
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.
S1, EP11 "Rockville Horror"
In 1994, 42-year-old Le Bich-Thuy is found dead next to her home; decades later, DNA and genealogy technology allow detectives to track down the killer.
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.
