Mark Harmon, 73, does not have any publicly confirmed serious or terminal health conditions
Mark Harmon, 73, does not have any publicly confirmed serious or terminal health conditions. Much of the speculation regarding his health appears to stem from his decision to leave NCIS to pursue less physically demanding roles, his age, and a reduced, more private public presence.
Here are the key details regarding his health and career status:
: Harmon left his role as Leroy Jethro Gibbs in 2021 primarily due to exhaustion from the grueling 18-season, 22-hour-day filming schedule and a desire to pursue new creative challenges.
: He underwent knee surgery (knee replacement) between seasons 12 and 13 of NCIS to fix a past football injury, which caused a noticeable limp on the show.
: He remains active in the entertainment industry as an executive producer and narrator for the prequel series NCIS: Origins (premiered October 2024).
: He is scheduled to return to feature films in Freakier Friday, releasing in August 2025.
: In 2023 and 2024, he co-authored two best-selling non-fiction books, showcasing his continued professional engagement.
While there have been unverified tabloid rumors in 2025 regarding potential health issues, there has been no official statement from Harmon or his representatives regarding any serious or, as some unsubstantiated rumors claimed, “terminal” illness. He continues to maintain a private life with his wife, Pam Dawber.
