Why is Stuart fraser not in taggart any more?

Stuart Fraser, who played the character of Detective Sergeant Brian McNair in the long-running Scottish television series "Taggart," left the show due to personal reasons and a desire to pursue other opportunities. His departure came as the series evolved, and various cast changes were made over the years. While specific details about his exit have not been extensively publicized, it reflects the natural progression of actors seeking new roles in their careers.