THIS is the shocking moment an ex-cop with "a thousand-yard stare" was gunned down by his former colleagues after suddenly reaching for a gun when asked why he was parked outside a police station.

Bodycam footage shows former Arapahoe County Sheriff's Deputy Mark Bidon sat waiting in a car outside his old police station with a blank look on his face.

3

The video, taken on October 29th in Colorado, shows Bidon getting shot nine times in the chest and arm, just seconds after he was told "not to move an inch".

A former colleague can be herd begging "Mark, what are you doing? Don't, don't, don't. don't, don't ... don't, don't" as he reaches for a pistol on his lap.

The officer, Buddy Gillespie, first radioed for backup after Bidon said "I'm here for my orders" with a "blank stare on his face" when asked why he was loitering outside.

A nervous Gillespie told his colleagues that Bidon seemed to be "having a mental episode."

3 Bidon was shot nine times after making a sudden movement with a gun on his lap

When the other deputies arrived, one of them described Bidon, who resigned from his post in 2010, as having a "thousand-yard stare".

Aiming his pistol at Bidon's head, a deputy tells him "don't move one inch. I'm serious, ok?"

But as one of the deputies reaches into the car to take the gun from his lap, Bidon appears to grab him, before getting shot nine times in quick succession.

"When the man turned the gun toward one of them, deputies discharged their weapons to stop the threat," the sheriff's statement said.

3 Mark Bidon worked at Arapahoe County Sherrif's Office until his resignation in 2010 Credit: Arapahoe County sheriff’s office

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"CPR was administered at the scene, without success."

Arapahoe County Coroner Kelly Lear said Bidon died from multiple gunshot wounds to his chest and left arm.

His death was classified as homicide and a review by the District Attorney ruled the shooting as justified.

Authorities confirmed in a statement that Bidon, 50, was an Arapahoe County deputy from 2000 until he resigned in 2010.

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