
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 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 1990, a Mississippi woman is kidnapped and raped at knifepoint; the case goes cold for decades until a DNA match from an unrelated crime identifies the perpetrator.
In 1972, a young woman is found covered in blood by the road in Snohomish County, WA.