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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.

Friends of accused murderer Robert Durst talk about his recent arrest in New Orleans and his whereabouts over the past 30 years.

After Kristen Grindley is found severely beaten on a road in Pullman, Wash., the investigation is hampered by the fact she cannot remember a single detail about the night in question.

A case pits father against son, husband against wife and brother against brother.