On September 25, the sad news of David McCallum’s passing at the age of 90 from natural causes emerged, leaving “NCIS” fans in mourning. Mark Harmon, who has portrayed Leroy Jethro Gibbs on the show since its pilot in 2003, expressed his condolences, stating, “David lived a great, full, long life. My condolences go out to Katherine and his family.” McCallum’s castmates, including Wilmer Valderrama, also paid tribute to the late actor. The official “NCIS” social media team shared their sorrow on Instagram, acknowledging McCallum’s legacy as a gifted actor and author. They expressed gratitude for CBS being his home for many years and conveyed their heartfelt condolences to his wife Katherine and the entire family.