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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, EP5 "March Massacre"
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.
S3, EP9 "The Slaying of Sylvia Quayle"
Sylvia Quayle is murdered in her Colorado home; four decades later, science brings her killer to justice.
S1, EP3 "Scottsdale Spree Shooting"
In 2018, two paralegals are shot dead while at work in Scottsdale, Ariz; four more victims are linked to the killing.
S2, EP7 "The Murder of Siobhan McGuinness"
In 1974, a 5-year-old girl disappears while walking to her friend's house; 46 years later, detectives are able to put the case to rest using modern DNA technology.
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.
