
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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The science of familial DNA is used to identify a rapist who eluded justice for years.
In 1999, hospital worker Jennifer Watkins is sexually assaulted and murdered; 20 years later, revolutionary DNA testing helps to solve the cold case.
In Sacramento, Calif., three woman are brutally assaulted by the same man; investigators use genealogy to track down the suspect.
A young couple is murdered in Montana in 1956; in 2019, investigators use voluntary genealogical databases to catch the killer.