Mark Harmon, best known for playing Leroy Jethro Gibbs on NCIS, found himself in controversy during his final years on the show. Reports of on-set tensions emerged, particularly involving his co-star Pauley Perrette, who played Abby Sciuto. Allegations suggested that a conflict arose after Harmon brought his dog to set, and an incident involving the animal reportedly led to safety concerns.

Perrette later made cryptic social media posts hinting at workplace issues, though she never mentioned Harmon by name. Speculation grew that this tension contributed to her exit from the show in 2018. While Harmon remained silent on the matter, the situation fueled rumors about behind-the-scenes drama.

Despite the controversy, Harmon stayed on NCIS until 2021, when he officially stepped away from his long-running role. While neither he nor Perrette publicly addressed the full details of their reported conflict, the situation left fans wondering about what truly happened behind the scenes.