MEMPHIS, Tenn. -- An arrest warrant has been issued for a Tennessee man in connection with the fatal shooting of rapper Young Dolph, who was gunned down in a daylight ambush at a popular cookie shop in November in his hometown of Memphis, authorities said Wednesday.A first-degree murder warrant was issued for Justin Johnson, 23, in the Nov. 17 shooting of Young Dolph, whose real name is Adolph Thornton Jr., the U.S.