Mark Harmon has opened up about the profound emotional impact of losing his longtime friend and David McCallum, his fellow NCIS co-star. Harmon described McCallum as more than just a colleague — he was a mentor, a trusted friend, and a guiding presence both on and off set.
Reflecting on the loss, Harmon admitted that grieving for someone he worked alongside for so many years left him heartbroken and struggling with deep sadness. He praised McCallum’s kindness, wisdom, and enduring legacy, emphasizing that the memories of their time together will forever remain cherished by the entire NCIS family.