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How a cup of coffee could solve a crime from 46 years ago

DNA revealed a family secret in these Viking remains 1:54 (CNN) — For 46 years, the answer to who killed Lindy Sue Biechler was a mystery. But with the help of DNA extracted from a coffee cup earlier this year, investigators were able to charge a Pennsylvania man with the 1975 stabbing of the 19-year-old

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