Go Behind the Scenes of 'NCIS' With Mark Harmon and the Cast (PHOTOS)

We did a little investigating of our own to find out about life on set for Mark Harmon (who played Leroy Jethro Gibbs until his on-screen exit from NCIS in Season 19 Episode 4) and our favorite cast.

Take a peek into the case file by scrolling down for the behind-the-scenes photos, along with insight into a few of the episodes and filming.

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