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Bloodline Detectives
Detectives and forensic experts recount the most extraordinary cold cases that were solved using the revolutionary technique of familial DNA testing.

S4, EP19 "The Sadistic Killer"
Investigative genetic genealogy unmasks the sexual deviant who raped and killed Christina Castiglione in 1983.

S4, EP13 "The Three Rivers Killer"
Investigative genetic genealogy reveals the killer of a young mother murdered in her own home 34 years prior.

S3, EP11 "The Mystery in the Parks"
Genetic genealogy brings answers to the families of two little girls who were murdered in 1986 in Tacoma, Wash.

S3, EP9 "The Slaying of Sylvia Quayle"
Sylvia Quayle is murdered in her Colorado home; four decades later, science brings her killer to justice.

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.