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

In 2001, a 7-year-old girl is sexually assaulted on her way to school.

In 1974, a 17-year-old girl is found murdered inside a culvert.

In 1979, a 16-year-old girl is last seen alive at Dairy Queen in Las Vegas.

A 60-year-old pharmacist is strangled and sexually assaulted in her home; almost 50 years later her killer is tracked down using genetic genealogy.