Former NCIS star Mark Harmon recently reflected on the beginnings of the show and his late friend and co-star David McCallum.

Where are they now?: Mark Harmon narrates NCIS: Origins, Pauley Perrette retired, and Michael Weatherly reunited with Cote de Pablo for a short-lived spinoff. Loss of a legend: David McCallum, the ...

Mark Harmon's Leroy Jethro Gibbs leads a team investigating various military-related crimes. When it debuted, that team ...