Dallas Police Officer Killed, Two Others Wounded in Shootout

Suspect also dead after high-speed chase and confrontation with police

Incident began with an officer found shot in a patrol car in Oak Cliff.
Two responding officers were also shot during an exchange of gunfire.
Suspect fled the scene, leading to a police pursuit ending in Lewisville.
Suspect was shot and killed after exiting vehicle with a long gun.
One officer remains in critical condition; another is stable and expected to recover.