'NCIS' Boss Explains Why Mark Harmon Didn't Return for Ducky's Funeral, Reveals If He'll Ever Come Back

NCIS honored the late David McCallum this past week with a tribute episode for his character Ducky, but the show’s original star Mark Harmon did not make an appearance. Michael Weatherly, who played Tony DiNozzo on the long-running CBS series, made a cameo appearance at Ducky’s funeral. So, why wasn’t Mark back as Gibbs? After