That happened at my university, though not to someone affiliated with the university. He was trying to break up a fight. He had a gun and it fell out its holster. He was grabbing for it as campus police were shouting not to. They shot and killed him. While you can argue about whether the police response and training was appropriate, one thing is definitely true. If he had not had a gun on him that day, he would not have been killed. A country awash in guns is not a better country, despite what the "a well armed society is a polite society" people claim.