After years of fruitless leads, investigators tap into a public genealogy website that leads them across the country to the killer they've been hunting, in this clip from Season 2, Episode 8.

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""Cold Case Files"" chronicles the journeys of the detectives who reopen cold cases. The detectives uncover new twists and startling revelations using breakthroughs in forensic technology and the influence of social media to help crack the cases-bringing long-awaited closure to the victim's families and friends.

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