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Dietzen Reveals McCallum's Role in His NCIS Career
9 Jun
Summary
- Dietzen credits David McCallum for his continued role on NCIS.
- McCallum personally requested more scenes with Dietzen.
- The on-screen friendship mirrors their real-life bond.

Brian Dietzen, star of the long-running CBS drama NCIS, recently shared profound insights into his relationship with the late David McCallum, who originated the beloved character of Ducky Mallard. Dietzen revealed on the podcast "NCIS: Partners & Probies" that McCallum was directly responsible for his sustained presence on the show. Initially a guest role, Dietzen's part expanded significantly after McCallum expressed a desire to do more scenes together, recognizing their on-screen chemistry.
Dietzen emphasized that McCallum acted as both a mentor and a friend, significantly influencing his career trajectory. He described McCallum as a foundational figure in NCIS, alongside other original cast members. The genuine bond between Dietzen and McCallum translated into their characters' on-screen friendship, which Dietzen considers a true reflection of their real-life connection.
McCallum, who passed away in September 2023, portrayed Ducky from the series' early episodes. The show honored his memory with a tribute episode co-written by Dietzen. NCIS is set to return for its 24th season in Fall 2026.