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Unlocking a decades-old murder mystery

The investigation into Janet Walsh's 1979 murder began with multiple suspects, but the leads dried up and decades passed. "48 Hours"' Peter Van Sant reports on a case with plenty of "twists and turns" that led detectives to a crime lab for a possible breakthrough. Watch "Janet's Secret" Saturday, Dec. 31 at 10 p.m. ET/PT on CBS.
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