David McCallum, the actor behind the iconic Dr. Donald "Ducky" Mallard on NCIS, has been a fan favorite since the show's beginning. Although he never fully departed from the CBS series ...

For decades, a fan favorite character on NCIS has been Dr. Donald "Ducky" Mallard. Played by David McCallum, the bow-tied coroner was a staple on the beloved television show ever since its inception.