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A deputy was killed and two other deputies injured in what is being described as an ambush shooting in Houston early today. The three Harris County Constable deputies were working an extra shift at a bar when it happened. The three had gone outside the 45 North Bar and Lounge to investigate a disturbance in the parking lot when they were shot from behind by a man with a rifle. A person of interest is in custody, but police have not determined whether they are a suspect or a witness.