A Colorado police officer who was caught on camera beating a suspect and throwing him around a cell has been fired and pleaded guilty to assault.

His and another officer's body cameras captured roughly 10 minutes of footage after Cpl Mark Magness, 51, arrested 48-year-old suspect Kent Lasnik, for allegedly attacking a liquor store clerk.

The video dates from December and begins with Magness taking the Lasnik from a police car and slamming him into a refrigerator next to a doorway.

The detainee apologizes before being put in a cell in the Federal Heights jail and then appears to aim a slap at Magness, which sends the officer into a violent rage.

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Cpl Mark Magness (right) and another officer are seen on surveillance footage telling suspect Kent Lasnik not to resist while Magness hits him 12 times. Magness was fired from the force after the December incident

Lasnik, 48, was heard apologizing to the officers before being placed in a cell where he attempted to slap Magness before the beating

Lasnik (left) was also seen being pushed into a refrigerator as he entered the Federal Heights, Colorado, station

It is unclear if the slap landed.

Magness proceeds to beat Lasnik as he cowers in a corner, and at one point the officer flings a chair across a room outside, according to ABC 7.

Prosecutors say that the officer then punched Lasnik seven times on the cell bench and five times when he was on the floor being handcuffed again.

Another officer warns his colleague that the event is being recorded, but Magness replies 'F*** that! F*** that!'

Magness's body camera was also turned on.

Lasnik was seen bleeding from his chin on the video as Magness pressed his head to the back of a chair and told him to stop resisting despite the suspect not moving

Magness takes Lasnik to a chair and yells at him to sit upright, eventually pressing his hands into his temples as the suspect apologizes and says that he 'won't do nothing else.'

The corporal then yells at the detainee to 'stop resisting', though Lasnik, whose chin is covered with blood, is not moving.

'You didn't take a swing at me, cool, I didn't even bust your face up either,' Magness says while applying pressure points and strapping Lasnik into the chair.

'You picked the wrong cop to fight with, man. I can tell you that right now'.

The officer told his supervisors that Lasnik 'stumbled into refrigerator', according to KDVR.

He was fired less than a month after the incident, according to 9 News, and pleaded guilty to misdemeanor assault on June 17 and received one year probation.

Magness (pictured) taunted the suspect and said 'You picked the wrong cop to fight with, man. I can tell you that right now' while applying pressure points and strapping him into a chair

Magness was fired at the end of last year and pleaded guilty earlier this month to misdemeanor assault, for which he received a year's probation. Above, the Federal Heights police station

The incident is not the first case of excessive force by Mangess.

During his first year in the department he pleaded guilty to misdemeanor reckless endangerment charge in 2009 and paid a $517 fine.

The charge stemmed from his throwing Dennis Discua to the ground and dislocating his shoulder after talking to him about illegal firework use.

Discua called 911 and Magness returned to the scene, allegedly claiming that he had no idea what happened.

Federal Heights was not required to fire him for the incident and he remained on the force.