Jirehl Brock and three other Iowa State football players along with three current or former Iowa football players and a student assistant have been charged in connection with the state’s investigation into illegal sports wagering at the two schools. A total of 15 football and basketball players and staffers with ties to the schools have been charged since last week in the ongoing investigation. Current athletes face a loss of eligibility for violating NCAA gambling rules. Brock and several other players are accused of tampering with records to disguise that they were under the legal betting age of 21 at the time they placed wagers.