NEW : This means the product will ship as received by the manufacturer, sealed, with all advertised components, and with the manufacturer warranty. Lancaster , Texas , officer killed in suburban Dallas shootout . Chief 's son also slain during exchange of gunfire with responding officers .
NEW : Police chief 's son also suspected in death of another man . Lancaster , Texas , officer killed in suburban Dallas shootout . Chief 's son also slain during exchange of gunfire with responding officers .