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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.

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Donna Sue Murder on Elm Street

In 2003, the skeletal remains of a young woman are found.

The Mammoth Lakes Murder

For 15 years, northern California is haunted by a serial rapist until genetic genealogy finally reveals the identity of the elusive sexual predator.

The Norcal Rapist

In 1976, a 16-year-old girl is found murdered near a roadside ditch in the small town of Walton, Ky.

Carol Sue Klaber

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S4 E6 | The Mammoth Lakes Murder