Mark Harmon Finally Confesses Why He Had To Leave NCIS After stellar performances on hit TV shows like St. Elsewhere, Chicago Hope, and NCIS, Mark Harmon quickly became one of Hollywood’s leading men, and a darling of the fans of all his shows. However, after a long 19-season run as the beloved Leroy Jethro Gibbs on NCIS, Mark suddenly called it quits on the show, leaving fans and viewers confused with his sudden exit. Several years after his shocking decision to leave NCIS, Mark has finally revealed the real reason why he was forced off the show despite being a beloved character. Stick around as we get right into it.
