Sean Murray recently shocked NCIS fans by revealing a long-kept secret about Mark Harmon. In a recent interview, Murray, who plays Timothy McGee, shared a behind-the-scenes story that many never knew. He explained that Harmon, known for his role as Leroy Jethro Gibbs, played a major role in shaping the show’s success in ways that weren’t always visible to viewers.

According to Murray, Harmon was not just the leading man but also a mentor to the cast. He revealed that Harmon quietly helped younger actors find their footing on set, offering guidance and support without seeking recognition. Murray admitted that Harmon personally advised him throughout his career, making a lasting impact on his performance and confidence.

Fans have always admired Harmon for his professionalism, but Murray’s revelation adds another layer to his legacy. Though Harmon departed the show in 2021, his influence continues to be felt both on and off-screen. Many are now looking back at his time on NCIS with even more appreciation, knowing the unseen ways he helped shape the series and its cast.