That extraordinary dash cam video caught on tape and one trooper who is a hero tonight. ABC's Chief Justice correspondent Pierre Thomas now. This is dash cam video of state trooper Tim -- martyr... See More
That extraordinary dash cam video caught on tape and one trooper who is a hero tonight. ABC's Chief Justice correspondent Pierre Thomas now. This is dash cam video of state trooper Tim -- martyr racing in his patrol car. Responding to a report of an armed gunman who is just killed three people. -- -- Don't hold that don't doubled -- but I thought it. It's December 21 of last year more days before Christmas in small town concluding. Up ahead coming -- to frame the suspect is intentionally hit another police car -- -- -- corporal Kevin Campbell is trapped in the other police car thanks police think he didn't you. Approach the passenger side of my vehicle and intend to execute me. Store -- decides to try to say officer Campbell -- ramming the suspect's vehicle to distract the shooter the suspect gets out of the truck fire. You can -- -- Mars windshield cracking as the bullets fly through. In this photograph you -- eight bullet holes it happened so fast streamlined -- down and you can see clearly right there. The suspect gun in hand a 357 Magnum coming towards -- -- -- -- is hit in the tested wrist but he's wearing a bulletproof vest. Staggering he and another officer returned fire killing the suspect. Split second decisions that save lives Pierre Thomas ABC news Washington.
This transcript has been automatically generated and may not be 100% accurate.