Preview: "48 Hours" double feature

      |It's double the mystery Saturday, May 4 on CBS. At 9 p.m. ET/PT, "48 Hours" plays a part in a daughter's decade-long quest to get justice for her murdered father. Then, all new at 10 p.m., a missing wife and a wild confession - what made a top chef jump from a California cliff? Richard Schlesinger reports.

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