For much of the 1970s and early 1980s, rangy character actor Ronny Cox was the actor of choice to play quiet, genial second fiddles who offered compassionate support to the leading men in Hollywood features and television series. He captured audiences’ attention with his first feature, “Deliverance” (1972), which showcased his musical skills in the classic “Dueling Banjos” scene. Later roles in films and TV projects like “A Case of Rape” (NBC, 1974), “Bound for Glory” (CBS, 1976) and “The Onion Field” (ABC, 1979) underscored his folksy, good-natured screen persona. A supporting turn as the