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

In 1985, when a young nurse is sexually assaulted by an unknown assailant, she turns to law enforcement to catch this sexual predator; despite her horrific ordeal, she never loses hope that her attacker will be caught.

The 1972 rape and murder of nine-year-old Debbie Lynn Randall is solved five decades later with the help of forensic science.

Wisconsin, 1976, 25-year-old David Schuldes and 24-year-old Ellen Matheys are murdered in a park; the case goes cold until 2015 when new DNA science is found.

In 1991, an intruder sexually assaults a woman in her own home in Chandler, Ariz.; the case goes unsolved for decades until revolutionary science connects the dots.