Mark Shera (born July 10, 1949, Bayonne, New Jersey) is an American film and television actor. Shera was cast from 1975 to 1976 in the television series S.W.A.T. in the role of Officer Dominic Luca. He also played J.R. in the television series Barnaby Jones from 1976-1980. Filmography Movies Television References External links 1949 births Living people American male film actors American male television actors Actors from Bayonne, New Jersey Male actors from New Jersey Male actors from Los Angeles