No one was killed in that incident, but seven people were wounded, and McKown's injuries were the worst. Today he's in a wheelchair and lives with excruciating pain. But he doesn't sit around asking, "Why me?"

"When people say, 'Why me?' — well, in my case, I know the answer: I went after a guy with a gun," McKown says.

It's not a course of action he recommends for everybody, but McKown says it's a choice he does not regret.