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Perez was trying to talk to Jones when he was fatally shot. Police do not believe they knew each other.
That's when a customer fired his gun at Jones.
"After he was struck once, the suspect started shooting at the front door," Cook told the Arlington Voice. "We know people were trying to escape, but we're not sure if he was just trying to harm others."
More than a dozen customers and a handful of employees were in the sports bar at the time of the shooting.
Cook said the customer, who was dining with his wife, "prevented further loss of life."
The customer was carrying a handgun under the Texas concealed handgun license program, Cook later confirmed.
"We're treating the good guy as sort of a hero," he said.