Eleven-time Pro Bowl performer Willie Roaf, one of the NFL's premier left tackles during his 13-year career, has informed Kansas City Chiefs officials that he is retiring. Roaf did not attend training camp with the rest of the Chiefs players. Chiefs officials said his absence was for personal reasons, but that they expected him to report within a few days. "I guess they want me to reconsider," Roaf told the Kansas City Star. "[But] I'm solid on retiring and going back to school."