In season 19, episode 4, the character solved a high-profile case in Alaska and made the decision to remain there rather than return to Washington, D.C. Gibbs’ departure was framed as a natural next chapter in his life, allowing him to spend time away from the Bureau after decades of service.

Origins showrunners about Mark Harmon's return and a surprise cameo in Tuesday's NCIS crossover - read the full Q&A.

CBS announced that Mark Harmon will reprise his role as Leroy Jethro Gibbs in an upcoming guest appearance on 'NCIS' and 'NCIS: Origins' on November 11 on CBS.