As Sean Payton spoke to a crowd of reporters after a rookie camp practice Saturday, he looked to his left and motioned for someone to join him. In rolled paralyzed former Tulane safety Devon Walker, operating a motorized wheelchair with his mouth and smiling with his eyes. ''We have some roster spots here,'' Payton began as Walker joined him alongside the Saints' practice fields. ''We're signing Devon Walker to a contract today with the New Orleans Saints.'' Walker was paralyzed from the neck down while making a tackle at Tulsa in September 2012. More...