WARNING: This article contains spoilers from NCIS. Ducky (played by David McCallum) is one of just two original characters left in NCIS, alongside veteran agent Leroy Gibbs (Mark Harmon).
While some viewers would also count Agent Timothy McGee (Sean Murray), he technically wasn't introduced until season one, episode seven Sub Rosa.
Ducky worked as the Chief Medical Examiner for most of the seasons but in March 2019, he decided to hang up his lab coat for good.
His assistant Jimmy Palmer (Brian Dietzen) then took over the role with Ducky instead of working as a part-time historian for NCIS. READ MORE: NCIS Fans uncovered huge 'plot hole' in season 6 Vance plotSo Ducky's role has been narrowed down quite a bit but he still remains an integral.
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