it was panic turning to fear. >> february 17th, 2003. the e2 nightclub, located one floor above the epitome restaurant in chicago's south loop, hopes to attract a large turnout with a special deejay performance. by 2:00 a.m., the club's security cameras are rolling as nearly 1,200 people pack inside. at the time, robert r. egan is the assistant state's attorney. >> the capacity for the club was just over 240 people. they had over four times that. frankly, they were wall to wall. it was literally jammed. >> suddenly, outside of the view of the cameras, a fight breaks out and a security guard discharges a can of pepper spray. >> the crowd reacted, not knowing what this was. somebody yelled out, "poison gas!"