Manhunt Intensifies for Alleged Memphis Cop Killer

Police say Tremaine Wilbourn gunned down Officer Sean Bolton during a routine traffic stop.
1:56 | 08/03/15

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Transcript for Manhunt Intensifies for Alleged Memphis Cop Killer
There is a manhunt right now for a cop killer in Memphis. Police searching for this man, he is armed and dangerous, wanted for gunning down an officer investigating an illegally parked car. ABC's Reena ninan here with the story. Good morning sh, Reena. Reporter: That man was on supervised release serving a federal sentence for robbing a bank. The Memphis police department has now vowed they will pursue the suspect exhausting all means until he is in police custody. This morning a massive manhunt under way for this man accused of killing a Memphis police officer in cold blood. When you look at this individual, you're looking at a coward. Call an ambulance. Ambulance is already en route. I need an ambulance now. Reporter: After Tremaine Wilbourn allegedly gunned down officer Sean Bolton during what officials say was a routine traffic stop turned deadly. It was a traffic stop and he was armed. Reporter: Passerby finding the officer bleeding on the ground, Bolton rushed to the hospital in critical condition dying later that night. Wilbourn and the vehicle's driver reportedly fleeing the scene. The driver taken into custody Sunday but released without charges. Wilbourn still on the run this morning. A warrant for first degree murder has been issued for his arrest. Reporter: The war veteran's death sending ripples through the community, the Memphis mayor calling attention to the dangers officers face on duty. They're dealing with folks who have no rules of engagement. Reporter: And Bolton's sister issuing a statement Sunday saying, my brother's life was just beginning. Only for it to end in a tragedy. Police now offering a $10,000 reward for any information that will help bring Wilbourn described as armed and dangerous to justice. This is the third time a Memphis police officer has been killed in the past four years accordi to officials and as for the alleged shooter he now faces first degree murder charges, Amy. All right, Reena, thanks for that.

This transcript has been automatically generated and may not be 100% accurate.

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