David McCallum, known for his role as Ducky on NCIS, appeared in fewer episodes in recent years to spend more time with his family. He stated that he wanted to prioritize his wife, children, grandchildren, and their cat. McCallum continued with the show despite feeling that his character had become redundant. In March 2018, Ducky stepped down from his role as a chief medical examiner, but remained a part of the show as a historian.

McCallum passed away at the age of 90 from natural causes, leaving behind a legacy of kindness and professionalism.