Oklahoma Police Shooting Captured On Body Camera

There has been another fatal shooting of an African American suspect by a white police officer.

In this case, the officer was a 73-year-old Tulsa, Okla., insurance executive moonlighting as a reserve deputy.

Convicted felon Eric Courtney Harris was the target of an undercover drugs and guns sting operation last Thursday. When he saw police vehicles pull up, he ran.

A pursuing officer wearing a body camera chased down and tackled Harris as other officers joined the struggle, the sheriff's department says one of them yelled a warning that he was about to use a taser.

See more on CBS News.

That was 73-year-old reserve deputy Bob Bates, an insurance executive and former police officer. He then pulled out what he said he thought was his taser.

Immediately afterward, a gunshot is heard on the video, as is an apology from Bates.

"Oh, I shot him! I'm sorry," Bates apparently says.

Maria Haberfeld, a professor of police science at John Jay College, said having a 73-year-old reserve officer involved in potentially dangerous police operation is uncommon.

"It's extremely unusual given the outcome" she said. "But we do have many officers who are in their 60s and 70s around the country so he happened to be in the wrong place at the wrong time."

As he lay bleeding, officers continued to cuff Harris. "He shot me! He shot me," Harris said.

When he complained of losing his breath, "I'm losing my breath..."

Someone replied: "(expletive) your breath."

Harris was taken to a hospital, where he died. Bates is not allowed to perform any police activities while an investigation is ongoing.

The Tulsa County sheriff's office blames Bates' mistake on a phenomenon called "slips and capture." The police sergeant leading the investigation says that's when a person's behavior slips off the intended course of action because it is captured by a stronger response. Prosecutors are now reviewing the case.

© 2015 CBS Interactive Inc. All Rights Reserved.