Three Sentences to Keep Pontiac Slayer From Getting Parole Jackson, Mich., April 8 (P)— Two life sentences for murder and a 60 to $0 year term for kidnap ing were added today to the pen alties the law has assessed against youthful Dominick Piccone, killer of three southern Michigan farm ers Piconne already was under life sentence for the murder March 31 of Cassius Barber, 71, of near Ox ford, Mich., in Oakland county. This morning the youth was taken into Oakland circuit court and heard Judge H. Russel Hol land sentence him to life for sec ond degree murder of Romaine C. Potter, 75, slain when he tried to prevent Piccone from going to the Barber farm the night Barber was killed. He also was ordered to serve 60 to S0 years for kidnaping h6-year-old Roy Thorpe, whom Piccone forced to drive him on a wild 900-mile ride about the state after the two murders. Circuit Judge John Simpson at Jackson this afternoon received Piccone’'s plea of guilty to first de gree murder in the killing of Carl MacKenzie, 47, Concord township farmer, and imposed another life sentence. MacKenzie was slain when he approached Piccone as the youth hid in a wood lot. Today's sentences were designed to remove any possibility that Piccone could ever gain his free dom on parole.