Broncos outside linebacker Jonathon Cooper entered a plea of not guilty to charges Monday morning in a Douglas County Courtroom.

HIs trial is set for July 22.

Cooper entered Judge Kelly Waidler’s courtroom about 9:45 a.m. accompanied by his Denver-based attorney Harvey Steinberg, who often represents Broncos and members of other Denver sports franchises in court.

Cooper had been arrested on two counts of domestic violence and one charge of criminal mischief following an incident Thursday night at his home with his girlfriend, who was arrested on the same charges.

He entered a plea of not guilty to all charges Monday with a motion hearing set for July 6 and a jury trial set for July 22.

Broncos director of player development Ray Jackson and former Broncos’ outside linebackers coach Michael Wilhoite were also in the courtroom in support of Cooper. Cooper’s girlfriend was not in attendance as her hearing is happening in a few days.

Cooper, 28, was booked into the Douglas County Jail early Friday morning. Both Cooper and his girlfriend were arrested, according to an affidavit obtained by The Denver Gazette.

Cooper’s girlfriend was arguing with Cooper in their apartment in Parker after she accused him of cheating. She told police she grabbed his phone and threw it across the room, then started to go through it, according to the affidavit.

Cooper then got into a physical struggle with her, grabbed her arm and took his phone back.

She then tried to take the phone back, and Cooper “braced his neck against (her) neck to prevent her from getting his phone,” the affidavit reads.

After the physical struggle was over, Cooper admitted that he told her that he was going to break her phone if she did not leave the apartment, and that he bit her phone when she did not leave, causing “disabling damage,” according to the affidavit.

The Broncos said in a statement to The Denver Gazette that the team is aware of the arrest and is working to gather more information. Cooper is being represented by Denver attorney Harvey Steinberg, who did not immediately return messages left by The Denver Gazette.

Cooper offered an apology following an arrest on charges of domestic violence.

“I apologize to my family to my friends and my community. … And so many others,” he wrote Saturday night on social media. ”I sincerely apologize. This situation is not who I am.’’

He also posted a Bible phrase on social media, which reads in part, “Do not let anger lead you into sin, and do not stay angry all day.”

Cooper, a seventh-round pick by Denver in 2021 out of Ohio State, is entering his sixth season with the Broncos. He was a part-time starter his first two seasons before becoming a regular starter in 2023.

Over the past three seasons, Cooper has 27 sacks and has played a key role on one of the NFL’s best defenses. He received a four-year, $54 million contract extension in November 2024, taking him through the 2028 season. He has a salary-cap number this season of $5.78 million.

Outside linebacker is considered to be Denver’s strongest position, with the Broncos also having two-time Pro Bowl selection Nik Bonitto as a starter and having solid reserve depth in Dondrea Tillman and Jonah Elliss.

The Broncos had their third organized team activities practice Thursday, and Cooper was on the field. The Broncos will conclude offseason drills with another round of organized team activities next Tuesday through Thursday and a mandatory minicamp June 16-18.

For more on this story and others, please visit the Denver Gazette’s news partners 9NEWS. Denver Gazette reporters Chris Tomasson and Matt Kyle contributed to this article.