Since Brian Dietzen became a series regular on NCIS in 2012, at the beginning of Season 10, Dietzen’s character, medical examiner Jimmy Palmer, has become an increasingly prominent figure in the series. Dietzen is one of only two cast members, along with Sean Murray, who have appeared in each of the show’s 22 seasons. Palmer originally served as the assistant to the venerable Dr. Donald “Ducky” Mallard, played by David McCallum, before becoming the NCIS chief medical examiner in 2019, in Season 16, when Ducky left the position and assumed the newfound position of NCIS historian.

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