CASTLE - "I, Witness" - Castle is hired to uncover if a client's husband is having an affair, but the case takes a shocking turn when Castle witnesses the client's murder - by her husband. But with no proof that the killing took place, Castle and Beckett must investigate to expose the truth, on "Castle," MONDAY, FEBRUARY 2 (10:01-11:00 p.m., ET) on the ABC Television Network. (ABC/Nicole Wilder) SEAMUS DEVER
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