Returns: 9 p.m. Friday, Jan. 6 Simon Camden, what did you do? Former "7th Heaven" star David Gallagher guests as a possible suspect in the murder of a mixed martial arts fighter. MMA star Tito Ortiz also guests. Also on CBS Jan. 6: "A Gifted Man," 8 p.m.; "Blue Bloods," 10 p.m.
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