Walter Clarence `` Buck '' Taylor , III ( born May 13 , 1938 ) is an American actor best known for his role as gunsmith-turned-deputy Newly O'Brien in 174 episodes during the last eight seasons of CBS 's `` Gunsmoke '' television series ( 1967 -- 1975 ) .
Walter Clarence `` Buck '' Taylor , III ( born May 13 , 1938 ) is an American actor . He is best known for his role as gunsmith-turned-deputy Newly O'Brien in the CBS 's television series `` Gunsmoke '' ( 1967 -- 1975 ) .