Twenty-six years after the murder of schoolteacher Christy Mirack, detectives get a break when a relative of the killer uploads DNA to a public genealogy website, in this clip from Season 2, Episode 4.

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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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