sentences:  The football team became embroiled in a different betting scandal later that year when federal prosecutors indicted four former players for perjury related to betting on their own games.In August 2001, Rashidi Williams, a senior safety, collapsed and died during practice from an asthma attack.An autopsy revealed that he had ephedrine, a stimulant banned by the NCAA, in his system which prompted Northwestern to investigate the prevalence of stimulants and other banned substances across all of its athletic programs.