Brian Dietzen breaks down the 'NCIS' tribute to David McCallum, that surprise appearance
David McCallum, beloved on "NCIS" for his role as the eccentric chief medical examiner Dr. Donald "Ducky ... McCallum's ...
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NCIS Cast: A Look at How They've Transformed Over the Years
From 2003 on, the cast of ... Mallard in NCIS that has endeared him to a new generation of fans. McCallum has been a series regular since 2003, playing the chief medical examiner for the team.