Brian Dietzen Totally Supports Michael Weatherly's Decision To Leave 'NCIS' Brian Dietzen is showing support for his 'NCIS' costar that plans to leave at the end of this season, but he really wants one thing to happen onscreen before Michael Weatherly goes.
Brian Dietzen Talks To Real Medical Examiner About 'NCIS' Accuracy In The Morgue 'NCIS' star Brian Dietzen portrays Jimmy Palmer who is medical examiner Dr. Donald 'Ducky' Mallard’s (David McCallum) assistant.