NCIS Season 21 premieres Monday, Feb. 12 at 9/8c; the McCallum/Ducky tribute will air the following week, on Feb. 19.
The Scottish actor had been the show’s last remaining original cast member following the exit of series lead Mark Harmon early in Season 19.
McCallum played Ducky for all 20 seasons that have aired thus far, most recently appearing (remotely) in the final two episodes of Season 20 last spring.
From Day 1, it was an honor to work with him and he never let us down.