FLASHBACK: Concealed Permit Holder Stops Attempted Mass Shooting In Chicago. “According to the Chicago Tribune, the driver was watching “a group of people” walk in front of his car on North Milwaukee Avenue just before midnight when 22-year-old Everardo Custodio allegedly ‘began firing into the crowd.’ The Uber driver pulled his own gun and ‘fired six shots at Custodio,’ wounding him in ‘the shin, thigh, and lower back.'”