Because his long-standing role as the CBS procedural's ... Ducky's arguably oldest friend, Leroy Jethro Gibbs (Mark Harmon), doesn't appear in person to pay his respects. According to "NCIS ...
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The Real-Life Legal Issues Of NCIS Star Mark Harmon, ExplainedMark Harmon is known for his role as Leroy Jethro Gibbs on "NCIS," a show filled with legal disputes, murder, and mystery.
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