He was the last member of the original cast remaining on the show through Season 20 before he died.

Speaking withTV Insider, showrunner David J. Brian shed tears writing it; the cast and crew shed tears shooting it."

When McCallum first passed, a couple of his former castmates shared touching tributes to their fallen friend.

David McCallum, NCIS

And your legacy will always be the love you have for your family.

Love to Katherine and the kids and the grandkids, your absolutely very favorite things."

I will miss you my friend."

David McCallum’s Ducky in NCIS

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