Corbett (Captain of department) said the plainclothes detective, whose name has not been released, had parked in front of Horn's house in response to the 911 call. He saw the men between Horn's house and his neighbor's before they crossed into Horn's front yard.
Corbett believes neither Horn nor the men knew a police officer was present.
"It was over within seconds. The detective never had time to say anything before the shots were fired," Corbett said. "At first, the officer was assessing the situation. Then he was worried Horn might mistake him for the 'wheel man' (get-away driver). He ducked at one point."
When Horn confronted the suspects in his yard, he raised his shotgun to his shoulder, Corbett said. However the men ignored his order to freeze.
Corbett said one man ran toward Horn, but had angled away from him toward the street when he was shot in the back just before reaching the curb.
"The detective confirmed that this suspect was actually closer to Horn after he initiated his run than at the time when first confronted," said Corbett. "Horn said he felt in jeopardy."