Mark Harmon’s Heartfelt Tribute to NCIS Co-Star David McCallum

Few actors manage to build a career so remarkable that audiences recognize them from several iconic roles across different generations. David McCallum was one of those rare talents. Before his passing on September 25, 2023, he had spent decades entertaining viewers through film and television.

Although younger audiences may remember him best as Dr. Donald “Ducky” Mallard on the CBS crime drama NCIS, McCallum had already achieved international recognition through productions such as The Man from U.N.C.L.E. and The Great Escape.

His death deeply affected the NCIS family, with several former colleagues sharing emotional messages about the privilege of working alongside him.

Among those paying tribute was Mark Harmon, who portrayed Special Agent Leroy Jethro Gibbs for 19 seasons. After Harmon departed the series, McCallum remained the final original cast member still associated with the show.

Speaking to TVLine following McCallum’s death, Harmon reflected on the extraordinary life of his longtime colleague. He expressed admiration for McCallum’s achievements and recalled how honored the cast had felt to share the screen with such an accomplished performer. Harmon also extended his condolences to McCallum’s wife, Katherine, and their family.

For an actor who rarely makes public statements, Harmon’s words demonstrated the respect and affection he had developed for McCallum throughout their years together.

A Friendship Built on Mutual Respect

Mark Harmon and David McCallum were both established actors long before NCIS became one of television’s most successful crime dramas.

Harmon’s career began in the 1970s, while McCallum had already become a familiar face to audiences during the 1960s. Their professional backgrounds helped establish a relationship founded on experience, admiration, and mutual understanding.

In a 2013 interview with The Seattle Times, Harmon emphasized that being the leading actor on NCIS did not make him more important than his fellow cast members. His comments reflected the collaborative atmosphere he valued on set.

Harmon’s appreciation for McCallum became especially evident during the celebration of the show’s 400th episode in 2020.

In an interview featured in TV Guide, Harmon recalled the excitement he felt when he first encountered McCallum. Having grown up familiar with his portrayal of Illya Kuryakin in The Man from U.N.C.L.E., Harmon was amazed to find himself working alongside the actor.

McCallum reportedly responded with amusement, reminding Harmon that the famous role belonged to a television era several decades earlier.

Despite Harmon’s reputation for playful practical jokes behind the scenes, his relationship with McCallum was characterized by genuine warmth and professional respect.

Their friendship extended beyond their fictional characters, Gibbs and Ducky, whose long-standing connection became an important part of NCIS.

McCallum’s passing marked the end of an extraordinary chapter in the show’s history. His legacy, however, continues through the memorable characters he portrayed, the colleagues he inspired, and the millions of viewers who followed his career.

For Mark Harmon and the wider NCIS family, David McCallum was far more than a talented co-star. He was a respected colleague, a cherished friend, and an unforgettable part of television history.