Mark Harmon's NCIS Exit Explained: What Happened To Gibbs?

Mark Harmon, 74, makes shock permanent return to NCIS universe... as fans fly into a frenzy

Mark Harmon Returns to 'NCIS: Origins' for Season 3 Arc After Shocking Exit

Mark Harmon Returning to ‘NCIS,’ Will Star in Season 3 of ‘Origins’ Prequel Show