The world of NCIS has always been built on loyalty, teamwork, and deep emotional connections—and perhaps no bond embodied that spirit more than the one between Brian Dietzen and the late David McCallum.
As Jimmy Palmer and Dr. Donald “Ducky” Mallard, their characters shared a touching mentor-mentee relationship that evolved over the years into something far more profound. But what fans loved onscreen was mirrored even more powerfully behind the scenes—where Brian and David formed a genuine friendship rooted in respect, admiration, and shared purpose.
The Mentor and the Student—On Screen and Off
When Brian Dietzen joined NCIS, David McCallum had already become an icon—one of the original cast members who helped turn the series into a global sensation. But instead of keeping his distance or towering above his younger co-stars, McCallum welcomed Dietzen with open arms.
Their onscreen chemistry—Ducky’s old-school British charm paired with Palmer’s nervous energy and eager-to-learn heart—quickly won over fans. Over time, Palmer evolved into a confident, compassionate medical examiner, and the shift felt earned. Why? Because it mirrored Brian’s own growth under David’s mentorship.
“A Legend, a Mentor, a Friend”
When David McCallum passed away in 2023 at the age of 90, the NCIS family—and fans around the world—felt a seismic loss. But no tribute hit harder than Brian Dietzen’s.
“A legend, a mentor, a friend,” Brian wrote in a heartfelt message.
“David was the epitome of grace and professionalism. He brought wisdom, kindness, and humor to every moment we shared, both on screen and off. I’ll miss our conversations. I’ll miss our laughs. But I’ll always carry the lessons you gave me.”
His words resonated deeply. Fans flooded social media with support and grief, sharing clips of Ducky and Palmer’s best scenes—those moments of quiet humanity that made NCIS more than just a procedural.
A Legacy That Lives On
Even though David McCallum is gone, his presence still echoes through the halls of NCIS. Jimmy Palmer continues Ducky’s legacy—not just as a medical examiner, but as a man of integrity, compassion, and quiet strength.
Behind every decision Palmer makes now, fans can feel Ducky’s influence. And behind every emotional moment Brian Dietzen brings to the screen, you can sense the gratitude of a student honoring his teacher.
David may have said goodbye, but through Brian—and through all of us who loved him—his spirit lives on.
