In May, he said he was eager to tack one more year onto his great career. In July, he sent a jolt through the Kansas City Chiefs when he retired on the eve of training camp. And on Thursday, Willie Roaf said he is done playing professional football. In a high-rise law office in downtown Kansas City, far removed from the stadiums and the cheers, the 11-time Pro Bowl left tackle who helped pave the way for one of the NFL's most dynamic offenses said his body couldn't take one more season.