Video : The Family / The Clue That Stuck

A detective vows not to shave until he solves the murder of a young Oregon woman. It takes three years and a string of Mexican Mafia informants to crack the case and allow the dedicated detective to shave his beard. And in a California case, investigators track down a killer with the help of DNA found on the duct tape used to wrap the murder victim's head.

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S04E19 - Man in the Shadows/The Hitchhiker