>> Hello, officer down! Officer down outside.>> Moments after Arizona trooper Edward Anderson was shoot along an interstate highway west of Phoenix, a panicked motorists used the officer's two-way radio to call for help.>> He's in real bad shape, please send air support, helicopter please.>> Anderson had been responding to a 911 call about shots being fired at a vehicle.
When he arrived, he saw a rollover wreck. Police say a woman had been ejected and killed. The 27-year veteran started setting up flares when police say the suspect opened fire, wounding Anderson.>> It's the middle of nowhere, it's dark, it's pitch black. And there's cars whizzing by at 80, 85 miles an hour.
And someone come out of the darkness and immediately shoot you.>> That's when police say a passing motorist saw the trooper wrestling with the suspect. The driver got out of his car and asked the officer if he could help.>> The trooper says, please help me. That person retreats back to his vehicle, removes his own weapon from the vehicle, confronts the suspect.
The uninvolved third party fires, striking and killing the suspect.>> Trooper Anderson was rushed to the hospital, where he remains in serious but stable condition. The suspect who attacked the officer has not been identified. Prosecutors will determine whether the motorist will face any charges.