As fans recall, Season 18 was a tumultuous one for both Gibbs and the actor who brings him to life. On screen, he faced suspension after attacking an animal abuser. Off screen, Mark Harmon was reportedly considering leaving until he was informed that the show would not continue without him.

Fans were left thinking that Gibbs was leaving and that NCIS, which is currently the most-watched drama series on TV, would come to an end after Season 18. Thankfully, Mark seems to love the series just as much as fans do. He opted to continue contract negotiations and, as of April 2021, CBS had renewed NCIS for its 19th season, with Mark still onboard. However, Mark's new deal allowed him to continue with the show for only a handful of episodes in Season 19. And, sadly, time is up.

NCIS showrunner Steve Binder confirmed in a statement, “As an executive producer and dear friend, Mark continues to be an integral part of the fabric of the show. Our north star has always been staying true to our characters, and that truth has always guided the stories we tell and where those characters go. 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.”