Tulsa Police Officer Ron Neal thought his law enforcement career might be over when he suffered a severe knee injury while arresting a combative drunken driver last year. But later he would learn that a Dallas police officer who died in the line of duty could give him a second chance. In October, a surgeon reconstructed the torn ligament in Neal’s knee using an Achilles tendon from an organ and tissue donor. “At that time, I knew nothing about the donor.