On a september evening in 1999, Dr. Richard Carmona was driving to a University of Arizona football game in Tucson when he came across a traffic accident. A pickup truck had rear-ended a car. Carmona, a trauma surgeon and deputy sheriff on the local SWAT team, started to approach the truck when bystanders shouted that the driver had a gun. Carmona, who was off duty but carrying a pistol, called for backup and moved in, asking the driver to put down his weapon. The man was a mentally ill ex-convict who had murdered his father that day. He looked at Carmona, started to put down the gun, then suddenly fired at the doctor, grazing his head. Carmona fired seven shots, hitting him three times and killing him.
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