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THE suspected gunman who allegedly shot and killed a pro-cop activist in Denver was not licensed to work as a security guard in the city, say reports.

Dramatic pics show the terrifying moment Matthew Dolloff, 30, allegedly shot dead Lee Keltner as violence erupted between rival groups on Saturday.

Matthew Dolloff was working as a security guard when he shot and killed a pro-cop protester in Denver on Saturday, reports claim
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Matthew Dolloff was working as a security guard when he shot and killed a pro-cop protester in Denver on Saturday, reports claimCredit: Denver Police Department
Military veteran Lee Keltner was later identified by his family members as the man Dolloff allegedly shot
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Military veteran Lee Keltner was later identified by his family members as the man Dolloff allegedly shot
Lee was fatally shot at around 3.30pm on Saturday
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Lee was fatally shot at around 3.30pm on SaturdayCredit: Getty Images - Getty

Dolloff, who appears to have frequently posted left-wing commentary online, was working as an armed guard for TV station 9NEWS at the time of the shooting.

The station had reportedly hired him through Pinkerton to protect their staff at the protest, a practice they said they've been doing "for a number of months".

However, the Denver Department of Excise and Licenses have confirmed there was "no record for an active licensed security guard now or ever" for Dolloff,  reported. 

"If he was operating as a security guard, he was in violation of the law," department spokesman Eric Escudero told the news station. 

"Security guards are prohibited from carrying or using a firearm without getting an armed firearm endorsement for their license.

"All security guards in Denver are required to get a federal background check before they receive their license."

Dolloff appeared to strike Lee moment before he was shot in the head
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Dolloff appeared to strike Lee moment before he was shot in the headCredit: Getty Images - Getty
Pictures reveal an altercation moments before the deadly shooting
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Pictures reveal an altercation moments before the deadly shootingCredit: Getty Images - Getty
Dolloff was pictured with a gun in his hands moments after the fatal shots
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Dolloff was pictured with a gun in his hands moments after the fatal shotsCredit: AP:Associated Press

Dolloff was last night being held without bail on suspicion of first-degree murder following the shooting that left Keltner dead.

Keltner had participated in a "Patriot Muster" rally in front of the Art Museum before he was fatally shot.

It's been reported the military veteran

Reports claimed he at an a "- Soup Drive" taking place during the same time as the "Patriot Muster" rally before he was killed.

After the Denver Police Department pinned Dolloff as the suspect, several messages on a Facebook page with his full name and a photo that appears to match his booking photo quickly filled up with hateful messages.

Some users speculated about him having a possible connection to radical left-wing groups.

He appears to be a supporter who attended Occupy protests back in 2012.

But police have sought to dispel rumors about Dolloff having any connections to Antifa.

Lee Keltner has been identified as the man shot dead in Denver
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Lee Keltner has been identified as the man shot dead in Denver
Lee was described as a 'loving husband, father and friend'
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Lee was described as a 'loving husband, father and friend'
Video shared to Twitter on Saturday appeared to show the altercation that took place before the shooting
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Video shared to Twitter on Saturday appeared to show the altercation that took place before the shooting

The Denver Police Department said on Saturday that an investigation determined he had "no affiliation" with the leftist political movement.

However, after the tragedy an Antifa supporter shouting “right in the f***ing dome”.

Older posts on Dolloff's possible Facebook page features photos and articles criticizing .

Most of his social media postings have to do with farm goods he apparently sold in the Denver area, and he appears to be pictured with dogs and sheep.

In the latest public on Dolloff's alleged page, he shared a message mourning the death of progressive political commentator Michael Brooks, who died in July.

Cops rushed to the scene after the victim was shot at 3:30pm
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Cops rushed to the scene after the victim was shot at 3:30pmCredit: JonDoe1980 OG
The man later identified as Keltner was rushed to the hospital, where he died an hour later
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The man later identified as Keltner was rushed to the hospital, where he died an hour laterCredit: JonDoe1980 OG
Cops took two people into custody after the shooting
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Cops took two people into custody after the shooting
The victim was rushed to the hospital in unknown condition
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The victim was rushed to the hospital in unknown condition

"The grief is real, no one better checked my world view more, and his impressions were amazing," he wrote.

"I cant seem to whip away the tears today Michael Brooks was to young [sic] and just getting started #leftisbest #MichaelBrooks I'm going to miss right-wing Mandela ... this is hard to accept."

The dead man sister, Suzan Keltner, on Sunday said her nephew has been struggling to cope after witnessing his father's death.

"He was my brother, my only sibling," Suzan told the . "He also served our country."

Jay Keltner, who identified himself as one of Lee's sons, also posted about the tragedy on Facebook, writing: "I can't believe my dad's gone. This will never be right #RIP."

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He told the  his father wasn't a member of any group and was there "to rally for the police department" as he had done so at previous protests. 

It is unclear if Jay was present during his father's death.

Police swarmed the area near Civic Center Park moments after the shooting in downtown Denver
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Police swarmed the area near Civic Center Park moments after the shooting in downtown Denver
Denver shooting victim Lee Keltner killed at Denver Antifa rally was hat maker and father
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