The man who killed at least 26 people in a Baptist church in a rural Texas town on Sunday died of a self-inflicted gunshot wound, Wilson County Sheriff Joe Tackitt told CBS News in an interview on Monday morning. Tackitt said gunfire was exchanged between the gunman and two armed citizens during a vehicle chase after the shootings. 'There was some gunfire exchanged, I believe, on the roadway also, and then (the shooter's vehicle) wrecked out,' said Tackitt. 'At this time we believe that he had a self-inflicted gunshot wound, after he wrecked out.'