A former TV producer and windsurfing champion says he’s in prison for a murder he didn’t commit -- the only physical evidence against him: a teaspoon of sand. "48 Hours" correspondent Erin Moriarty reports.

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How a bakery worker’s secret plan to recover DNA from a discarded Coke can helped investigators solve the cold case of a college student murdered over Thanksgiving weekend. "48 Hours" correspondent Peter Van Sant reports.

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An inside look at the startling evidence that helped convict against Colorado man Patrick Frazee for the murder of his fianceé. CBS News correspondent Nikki Battiste reports.

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A woman repeatedly threatened to kill her ex. She enlisted her father to help make good on her promise. Why couldn’t anyone stop her? "48 Hours" correspondent Peter Van Sant reports.

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A brutal murder and police have DNA evidence — could a discarded cigarette lead investigators to a possible killer and close a case two decades later? CBS News correspondent Anne-Marie Green reports.

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A young woman vanished after a night out in Milwaukee in October 2013. Did a meeting set up on a dating app lead to the disappearance or was it someone she knew? "48 Hours" correspondent Peter Van Sant reports.

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The wife of a NYC businessman is suspected of murdering him with help from her brother -- why would she want him dead and why did it take more than two decades to crack the case? "48 Hours" correspondent Richard Schlesinger reports.

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A teen’s death appeared to be a suicide -- but investigators say she was helped by a friend who recorded it and weeks earlier texted “it's like getting away with murder.” CBS News correspondent David Begnaud reports.

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An Ohio mom is brutally murdered. A detective pursues the wrong suspects, while the real killer walked free. It would take a dedicated sheriff to find a real suspect. Were there other victims? CBS News' Jim Axelrod reports.

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Twenty-six school children abducted and buried alive in a truck trailer by three young men. An incredible survival story. CBS News' David Begnaud reports.

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