Thad greenwood (roger ewing), son of and deputy to an oklahoma sheriff, arrives in dodge pursuing vandals on his father's warrant, not realizing the. roger ewing (born january 12, 1942) was the actor who played deputy u. s. in gunsmoke’s eleventh season, a dynamic shift occurred with the introduction of thaddeus “thad” greenwood, an enraged teenager driven by vengeance against.
