Dallas Cowboys receiver Michael Irvin walks off the field after the team failed to make a first down against the Arizona Cardinals during the second quarter in Irving, Texas, in this Oct. 13, 1996 photo. Irvin, one of the NFL's great receivers, has been advised by doctors to stop playing football because of a spinal condition and plans to retire, the Fort Worth Star-Telegram reported Tuesday May 23, 2000. (AP Photo/Linda Kaye)