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ARAPAHOE COUNTY, Colo. — Body camera footage has been released in the fatal shooting that took the life of a former Arapahoe County Sheriff’s Office deputy outside of the headquarters in October.

Mark Bidon, 50, was shot by an Arapahoe County deputy at 9:45 p.m. on Oct. 29. Bidon was a deputy from 2000 to 2010, when he resigned.

According to the sheriff’s office and the video, an on-duty deputy exiting the parking lot observed a vehicle backed into the exit gate area.

The deputy contacted the driver and observed that he had a gun. Two other deputies arrived almost immediately.

In the video, deputies can be heard telling Bidon not to move “an inch” before Bidon appears to shift in his seat.

Deputies say he turned the gun toward one of them. At that moment, deputies can be heard shouting, “Mark, what are you doing? Don’t, don’t, don’t. don’t, don’t … don’t, don’t.”

Deputies then fired their weapons to stop the threat, the sheriff’s office said. Nine shots were fired.

CPR was administered without success.

“(The deputy is) approaching really cautiously,” University of Denver professor of psychology Kim Gorens said. “That’s one of the fundamental principles of crisis intervention, right, is open body language.”

In cases such as these, she said deputies are having to ask themselves lots of question in just seconds.

“The last one being, is there weapon?” Gorgens said. “What’s this person’s access to that that weapon? … So all of those things are rolling out simultaneously.”

She believes the deputies handled this situation appropriately.

So does the Arapahoe County District Attorney’s Office, which said the shooting was justified.

Bidon never fired a shot. None of the officers was hurt. What Bidon was trying to accomplish is not clear.

He resigned from the department in 2010.