Mark Harmon Exits ‘NCIS’ After 18 Seasons as Leroy Jethro Gibbs
Mark Harmon Exits ‘NCIS’ After 18 Seasons: What’s Next for the Show? In a stunning twist for fans of the long-running CBS procedural, Mark Harmon has bid farewell to “NCIS” after 18 seasons as Leroy Jethro Gibbs. Despite his departure as a regular cast member, Harmon remains integral as an executive producer and a beloved…