Police said the customer saw the child’s reflection with Gray in the stall and thought she was being touched inappropriately.
The customer wasn’t completely sure so he told police he flushed the toilet to let Gray know he was also in the bathroom.
Gray, who was in a motorized wheelchair at the time, started panicking when he heard the flush.
The witness claims he then saw both Gray and the girl naked from the waist down.
Gray allegedly got dressed quickly and tried to leave the bathroom.
When he was confronted by the customer, Gray allegedly pulled out a stun gun and said: ‘I’ll f***ing kill you.’