It's the end of an era for "NCIS" fans as Mark Harmon says "goodbye" to the long-running crime series.
While Gibbs might have worked his last case, "NCIS" producers are revealing how the door is always open for a potential return in the future.
Mark Harmon Departs NCIS After 18 Seasons: He's 'Always Going to Be a Part of the Show'
The actor has starred as Special Agent Leroy Jethro Gibbs since the show’s premiere in 2003
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