The Washington State Cougars have only officially retired two numbers: 7 and 14. The former was worn by one of the greatest football players ever, Mel Hein; the latter by Jack Thompson, godfather to the modern era of WSU quarterbacks.
Since then, though, there have been numbers that have been unofficially retired for a time. For more than 20 years, nobody has worn No. 91 — it was last worn by defensive tackle Leon Bender, a standout on the 1997 Pac-10 champs who died from a seizure shortly after being drafted in the second round by the Oakland Raiders.