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Mark Harmon - Wikipedia
Mark Harmon's NCIS Exit Explained: What Happened To Gibbs? - Screen Rant
Mark Harmon Opens up About His ‘NCIS’ Exit for the First Time
Mark Harmon - IMDb
Mark Harmon Opens Up His 'NCIS' Departure After 19 Seasons
Mark Harmon exits ‘NCIS’ - CNN
NCIS (TV Series 2003– ) - IMDb
Mark Harmon Addresses 'NCIS' Exit After 19 Seasons for First Time
'NCIS': Mark Harmon Departs After 18 Years - The Hollywood Reporter
Mark Harmon Bids Farewell to NCIS After 18 Seasons