Boston Celtics forward Jared Sullinger pleaded not guilty Tuesday to domestic violence-related charges after allegedly repeatedly pinning his girlfriend to a bed and the floor.

Bail for Sullinger, 21, was set at $5,000 after his plea on charges including assault and battery and intimidation of a witness.

Later Tuesday, Sullinger released a statement through the Celtics in which he apologized and called the experience “humbling and embarrassing.”

“I know that this situation has brought both sorrow and embarrassment to my girlfriend, my family, the Boston Celtics organization, my teammates, and my fans,” he said. “To all of you, I apologize from the bottom of my heart.”

Police say officers were called to Sullinger’s residence Saturday evening by his girlfriend, Deann Smith. She told them that earlier that day he’d assaulted her after she accused him of cheating on her and began packing.

Reported by the Associated Press