Turner was a finalist in the 110 m at the 1983 World Championships in Athletics and achieved his personal record in the event (13.17) that same year. He ranked number three in the world in sprint hurdles in 1982 and second in the world behind Greg Foster in 1983. He ran at the 1983 AAA Championships, being runner-up to Tonie Campbell. He was twice a medallist at the Pacific Conference Games, taking 400 m hurdles silver behind Garry Brown in 1977 and winning 110 m hurdles in 1981.