Story highlights "I thought I was going to get run over. I was trying to stop him," officer says

University of Cincinnati Police Officer Ray Tensing shot Samuel DuBose during a July 19 traffic stop

A prosecutor calls the shooting "asinine" and "totally unwarranted"

(CNN) University of Cincinnati Police Officer Ray Tensing was indicted Wednesday on a murder charge in the shooting death of Samuel DuBose.

If convicted, Tensing could go to prison for life, Hamilton County Prosecutor Joe Deters said in a news conference. Deters played body camera footage of the traffic stop shooting that appeared to contradict Tensing's version of what happened.

"I've been doing this for over 30 years. This is the most asinine act I've ever seen a police officer make -- totally unwarranted," said Deters. "It's an absolute tragedy in the year 2015 that anyone would behave in this manner. It was senseless."

The prosecutor, who said he was shocked when he first saw the video, was adamant DuBose, who is black, had not acted aggressively toward Tensing, who is white.

"People want to believe that Mr. DuBose had done something violent towards the officer -- he did not. He did not at all. I feel so sorry for his family and what they lost, and I feel sorry for the community, too," Deters said.

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