In February of 1974, the body of a 25-year-old woman was found covered in snow in a roadside ditch after she headed out hitchhiking in Minnesota. Despite an eyewitness watching a man dispose of her body and drive off, decades passed without answers in the case. But eventually, DNA testing would bring closure - too late for some, but not for her remorseless killer. This is the murder of Mary Schlais.

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