Why did judge Garth leave Virginian?

Judge Garth, portrayed by Lee J. Cobb, left "The Virginian" primarily due to the actor's decision to leave the show for personal reasons. His departure was written into the storyline as Judge Garth retiring from his position, which allowed for the introduction of new characters and dynamics within the series. Cobb's exit marked a significant shift in the show, as he was a central character in its early seasons.