Knock knock, who's there?

Houston - A Texas State Trooper is at the center of an investigation after he shot one of his neighbors at a Downtown Houston apartment complex on 500 Crawford Street.

The state trooper who’s been with the Texas Department of Public Safety for two years apparently mistook his neighbor for a burglar and shot him.

Just after midnight, the Texas State Trooper heard someone trying to get into his Downtown Houston mid-rise apartment.

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