This week in a two-hour special 20/20 examines the murder of Christa Worthington in a tranquil town on Cape Cod. Jan. 6, 2002, in Truro, Massachusetts, and 46-year-old single mom and fashion writer Worthington was found dead in her cottage by the sea. She’d been stabbed to death and her two-year-old daughter was found alive next to her body. The whole community was shocked and yet despite a large investigation and many suspects, the case went cold. Then almost three years after the murder and in a somewhat unusual move the investigation put out a request for voluntary DNA samples...read more