David McCallum was a major part of "NCIS," but another big name was pitched to play the role of Ducky when the crime drama ...
Fans were disappointed that Mark Harmon didn't appear as Gibbs in the "NCIS" Ducky tribute episode. But there was a simple explanation for his absence.
Former NCIS star Mark Harmon recently reflected on the beginnings of the show and his late friend and co-star David McCallum.
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