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DENVER — They are our heroes on the sports fields and arenas.

But another beloved professional athlete in Denver finds himself on the wrong side of the law.

This time, it’s Denver Nuggets player Ty Lawson.

The Arapahoe County Sheriff’s Office arrested the starting point guard and his 6-months pregnant, live-in girlfriend Ashley Pettiford Saturday morning.

Lawson trades in his Nuggets blue for inmate orange.

The change in uniform the result of what allegedly happened inside his home at the gated Cherry Creek Country Club.

Sheriff’s deputies were checking on Pettiford after she hung the phone up on her mom, Rose Day of Virginia, during an argument with Lawson.

A police offense report says about 2:30 a.m. Saturday Pettiford “heard Lawson on the phone with another woman. She heard this from the box in the bedroom that he has his phone hooked up to.”

The report says, “At this point she decided that she was tired of all of it and was going to pack her things and move.”

“Lawson was upset and yelling and then began grabbing her clothes and throwing them around the bed.”

Pettiford says Lawson twice “grabbed both of her arms, above the elbow and started pushing her back to the bed…”

The 24-year-old says she “was able to (get) his hands off of her arms,” the first time. But the second time, she ended up on the bed. The report says “she was unsure if he pushed her down on the bed or if she fell on the bed.”

Lawson says “…he did push her out of the way but not like a real push.”

Pettiford then says she threw Lawson’s phone, breaking it.

Lawson retaliated and threw her phone against the wall, then “put water on it.”

“You don’t hear anything about him outside of his play on the court. But he seems to be a pretty standup guy, as far as his personal life,” says Nuggets fan Peggy Boyd.

She and other fans are surprised about the arrest. Some say it could be a game changer for the team.

“If it’s true, I’m disappointed. In fact, it’s going to cause problems for the ball team. You’re a family when you’re on a team…We need those kind of players to be on the court, not in the jailhouses,” says fan, Keith Huss.

The Denver Nuggets released this statement:

“We are fully aware of an incident involving Ty Lawson over the weekend. Per team policy and out of respect for the legal process, we will have no further comment at this time.”

Lawson faces charges of harassment, criminal mischief and domestic violence.

Pettiford is accused of criminal mischief and domestic violence.

Lawson is back in a courtroom Friday.