In 1998, two former Northwestern basketball players, Kenneth Dion Lee and Dewey Williams, were charged and convicted for sports bribery. The players were part of a gambling ring and received money to fix three games against other Big 10 schools during the 1995 season. 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.