When Brian Dietzen first appeared on NCIS in 2004 as quirky assistant medical examiner Jimmy Palmer, no one expected him to become a series regular—let alone one of the show’s most beloved and emotionally grounded characters. But two decades later, Palmer is still standing—and fans are more devoted to him than ever.
Originally written for one episode, Jimmy was meant to be temporary. But Dietzen’s blend of nervous charm, comedic timing, and quiet empathy quickly made him a fan favorite. Over the years, Palmer went from background support to chief medical examiner, showing a full arc of growth, pain, and perseverance.
Off-screen, Dietzen is just as inspiring. He co-wrote one of the show’s most emotionally powerful episodes (“The Helpers”), which explored fatherhood, fear, and what it means to be human—all through Palmer’s eyes. And after experiencing a health scare in real life, Brian returned stronger than ever, with even more heart in every scene.
Jimmy Palmer might not carry a gun, but he’s carried the emotional weight of NCIS through its darkest and most beautiful moments. He’s proof that you don’t need to be the loudest to be the strongest.
