Mark Harmon exits 'NCIS' after 18 years on the show, will remain a producer
Mark Harmon officially ended his run as a series regular on CBS’ long-running procedural drama "NCIS" Monday. The latest episode acted as a goodbye for Harmon’s character, Special Agent Leroy Jethro Gibbs, who has been with the series for the past 18 years after first being introduced on the show "JAG" in 2003. According to Deadline, Monday’s episode, "Great Wide Open," saw Gibbs and Special Agent Timothy McGee, played by Sam Murray, venture to Alaska to find a contract killer who was hired by a local company. In the aftermath of the case, Gibbs suddenly informed his partner and NCIS director, Vance (Rocky Carroll), that he would not be returning to law enforcement.