Mark Harmon, Leaves 'NCIS', After 18 Seasons.<br />Mark Harmon has left “NCIS” as a regular cast member following 18 seasons portraying the show’s main character, Leroy Jethro Gibbs.<br />Mark Harmon has left “NCIS” as a regular cast member following 18 seasons portraying the show’s main character, Leroy Jethro Gibbs.<br />As an executive producer and dear friend, <br />Mark continues to be an integral part <br />of the fabric of the show. Our north star <br />has always been staying true to our <br />characters, and that truth has always <br />guided the stories we tell and <br />where those characters go. , Steven Binder, NCIS Showrunner, via TheWrap.<br />So regarding the future of Gibbs, as long-time fans of the show may have noticed over the years…never count Leroy Jethro Gibbs out, Steven Binder, NCIS Showrunner, via TheWrap.<br />Yahoo reports that CBS did not comment <br />on whether or not Harmon will <br />reprise the role in later episodes.<br />Harmon’s exit came as the conclusion of a four-episode storyline that started Season 19, picking up where Season 18 left off. .<br />According to Yahoo, Gibbs is such an integral part of the NCIS universe that it’s hard to believe he won’t return to the long-running show. .<br />According to Yahoo, Gibbs is such an integral part of the NCIS universe that it’s hard to believe he won’t return to the long-running show. .<br />The NCIS universe has expanded over the years <br />to now include “NCIS: Los Angeles” <br />and the new “NCIS: Hawaii.” .<br />The NCIS universe has expanded over the years <br />to now include “NCIS: Los Angeles” <br />and the new “NCIS: Hawaii.” .<br />It remains unclear who will replace Gibbs <br />as the main character of the show.<br />Yahoo suggests that long-time <br />cast member Sean Murray's character <br />Tim McGee is a likely replacement.<br />Yahoo suggests that long-time <br />cast member Sean Murray's character <br />Tim McGee is a likely replacement.<br />New series regular Gary Cole, who plays<br />FBI agent Parker, is another possibility.
