• Mark Harmon and Sean Murray co-starred on NCIS
  • Their relationship is still close after Harmon's exit
  • THIS is what Sean Murray says about his co-star

Mark Harmon, 70, is best known for his role as Special Agent "Leroy Jethro Gibbs" in the series NCIS. After 18 years and just as many seasons, the actor left the show in 2021.

Sean Murray, 44, landed the role of Special Agent "Timothy McGee" alongside Mark Harmon in 2003. But the friendship between Sean and Mark began even before their time together on NCIS.

NCIS: That's how close Mark Harmon and Sean Murray are

In 1993, NCIS stars Mark Harmon and Sean Murray collaborated on Harts of the West. Then, they had nearly two decades on NCIS, before Harmon moved on last year.

After almost 30 years in each other's lives, the "McGee" actor just revealed to TV Insider: "Mark is like family to me and always will be."

Murray added that having "Gibbs" on NCIS was very much like a "family structure with a paternal figure." And it was "McGee" who got to send-off his mentor "Gibbs" in his goodbye episode.

Also interesting:

This past weekend, Sean Murray was with his colleagues at PaleyFest in LA, where for the first time nearly the whole NCIS universe was together. But no Mark Harmon sighting, sadly!

Gary Cole, 65, has the part of Special Agent "Alden Parker," who took over from "Gibbs" as team leader in NCIS season 19. And while Gary Cole can't replace Mark Harmon, he and Sean Murray are "having a blast," they told TV Insider.