A woman has come forward with an accusation against UFC star Conor McGregor.

The Irish woman filed a formal complaint alleging that McGregor assaulted her on his yacht in Ibiza, which caused her to flee by jumping off the ship into the water.

The complaint alleges that McGregor punched the woman in the face and kicked her, knocking her to the ground. Her wrist was injured in the altercation.

A representative for McGregor, Karen Kessler, denies the claims. In a statement to ESPN, Kessler said, “Mr. McGregor is steadfast in his denial of all the accusations made by a guest on his boat.”

The complaint details how the woman and some friends joined McGregor for his birthday party at a nightclub in Ibiza, Spain on July 16.

The woman says she’s from the same neighborhood as McGregor and knows him from before he became famous. She says that she joined McGregor, his partner, and two other friends for an overnight party on his yacht between 3 and 4AM.

According to the complaint, McGregor’s partner went to bed and the situation escalated soon after. “His whole behavior changed and he became very aggressive.” She adds in the complaint that he told her, “I’m going to drown you, who do you think you are?”

She says it was as if McGregor was possessed.