Kansas City Chiefs guard Will Shields, an ironman at his position, announced his retirement from the NFL on Sunday. In a statement on his Web site, Shields said his "decision to hang up my cleats has not been an easy one to make for me but one I knew I would eventually have to make." The 35-year-old Shields missed just one game over his career, and that was during his rookie campaign in 1993 with the Chiefs. He was chosen to 12 straight Pro Bowls to end his career, the longest active streak in the NFL and a Chiefs record. "Today, I am letting everyone know that I am putting away my pads," Shields said on his Web Site. "I am looking forward to a future filled with sports in mind. Whether it is in the stands, on the sideline, in the press box or in a office, football will remain in my blood."