Investigators have identified a former Utah state trooper as a suspect in a series of highway shootings in Dallas that left two motorists dead, police said. Brian Smith, 37, who now lives in Keller, shot himself early Tuesday during a standoff in Garland with a SWAT team. Smith was listed in critical condition at Parkland Memorial Hospital in Dallas. "We feel confident because of the ballistics tests that we have at this point that he (Smith) is responsible for the shootings, " said Sgt. Gil Cerda, police spokesman... Smith supervised about five patrolmen in the Salt Lake City area and...