Strange as it may seem, a former NFL and college football star is opening up about his battles with "dissociative identity disorder", formerly known as "multiple personality disorder".

Herschel Walker won the Heisman Trophy in 1982 as college football's top player, a punishing but fast running back for Georgia.  However, in an interview on ABC's "Nightline," Herschel Walker admits he has several different personas that he can't run away from or bowl over.  
               
The former Minnesota Vikings and Dallas Cowboys great says he was able to keep the disorder under control until he retired from football.  On one occasion though, Walker recalls one time after he retired when he sat alone at his kitchen table playing Russian roulette with a loaded pistol. 

Walker says he doesn't remember many events in his life, including winning the Heisman Trophy in 1982.  Tragically, doctors say periods of memory loss are one of the symptoms of disorder. 

Walker has written a book called "Breaking Free" discussing his plight in detail.