After his arrest for allegedly storming the U.S. Capitol building and kicking a police officer on Jan. 6, Patrick Montgomery was released from custody and allowed to return to Colorado — with a few stipulations, including that he not possess any firearms.

So federal prosecutors said they were disturbed to learn that Montgomery recently shot and killed a 170-pound mountain lion and then proudly posed for photos with the corpse. Colorado officials say he also broke state laws because he was banned from owning firearms due to an old felony robbery conviction.

Now, federal prosecutors have filed a motion to revoke his release and asked a judge to place the 48-year-old on house arrest with a GPS monitor. He could also face new state charges.

“Given that Montgomery has repeatedly and flagrantly violated both state and federal law while on pretrial release in this case — including by possessing and using a firearm — the Government respectfully requests that the Court revoke his release pending trial,” prosecutors said in the motion.

Montgomery is just one of the hundreds of people charged in the deadly insurrection at the U.S. Capitol. Federal investigators have been building cases against alleged rioters using social media posts, tips from family members and even online dating profiles.

Tipsters identified Montgomery in photos posted to Facebook that allegedly showed him inside the Capitol building on Jan. 6. One tipster sent Montgomery a message letting him know that he had been reported to the FBI.

“I’m not a scared cat or running from anything,” Montgomery wrote back, according to a criminal complaint. “I didn’t storm the castle violently. My group was let in peacefully by the police we were talking to with respect.”

In fact, prosecutors said, the Littleton, Colo.-resident tried to grab a police officer’s baton, wrestled him to the ground and kicked him in the chest. Then he “held up his two middle fingers” at the officer, according to court records.

Many have argued that President Donald Trump's efforts amounted to an attempted coup on Jan. 6. Was it? And why does that matter? (Monica Rodman, Sarah Hashemi/The Washington Post)

He was arrested in Colorado on Jan. 17, according to court records, and charged with 10 criminal counts, including assaulting a police officer.

Not long after he was federally charged, the professional hunter and guide also became the subject of an investigation by Colorado Parks and Wildlife officials who said he illegally harvested a bobcat in late January.

According to a motion to revoke Montgomery’s pretrial release, the hunter pursued the bobcat on Jan. 25 for more than 11 miles with his dogs, violating local laws. Then, he knocked the cat out of a tree with a slingshot and allowed his dogs to maul it. In Colorado, it is illegal to use a slingshot or dogs to kill a “furbearer,” which is any animal hunted for its coat, including bobcats. A Colorado wildlife officer cited Montgomery for illegally harvesting the cat.

Then on March 31 — nearly two months after he was released on bond — Montgomery pursued a 170-pound mountain lion with his four hunting dogs. The dogs chased the big cat into a tree, where Montgomery fired two bullets from a .357 pistol, according to federal court records. After the mountain lion died, the hunter posed for a photo with his arms wrapped around the dead animal.

Montgomery followed Colorado rules that allow hunters to harvest mountain lions, including getting the right permits and reporting the kill for officials to inspect. But federal prosecutors and Colorado wildlife officers now say Montgomery should never have had the gun he used to hunt the big cat.

In addition to the federal ban on keeping weapons while on pretrial release, Montgomery had also been previously convicted of three counts of robbery in New Mexico in 1996. He told a Colorado wildlife officer that the crimes occurred when he was in college “doing stupid stuff” and “knocking stores over to get travel money,” according to court records.

He pleaded guilty to a felony robbery charge and was sentenced to six years in prison. He told a wildlife officer that part of his plea deal allowed him to own and use firearms for hunting, but when Colorado officials pulled the court records, they could find no provision in Montgomery’s plea deal that allowed him to continue possessing guns.

Colorado officials also noted in a court filing that Montgomery was a prolific hunter who claimed to have trapped 100 mountain lions in the past five years, including 20 in the most recent hunting season.

Montgomery told an officer in April that he “did not understand why this was popping up now,” after years of hunting in Colorado without incident. The officer said the state agency that oversees hunting had only recently learned of his New Mexico conviction.

He has a court appearance on Monday to finalize more strict bond conditions and house arrest, but a date has not yet been set for his federal trial, according to court records.

Montgomery could also face state charges of illegal hunting practices and possessing a firearm as a felon.