Chael Sonnen allegedly threw a woman into a light fixture and struck her -- causing her to bleed from her face -- during a wild fight in a Las Vegas hotel in December 2021 ... according to new police documents, obtained by TMZ Sports.
In the docs, officers from the Las Vegas Metropolitan Police Dept. say they responded to the Four Seasons Hotel on Dec. 18 regarding an alleged fight between Sonnen and several other people, including security guards.
Cops in the documents say a Four Seasons Engineer told them the altercation all started as he was coming out of a room.
Cops say the man said as soon as he opened the door, Sonnen punched him in the jaw. Officers say the man told them he then closed the door and called for security.
Police in the documents say, though, that a short time later ... a couple told them they encountered Sonnen outside of the room and the former UFC star got aggressive immediately.
Cops say Christopher Stellpflug and his wife, Julie Stellpflug, told them Sonnen -- who was apparently wearing a white robe and a partially bloodied T-shirt -- knocked a glass out of Christopher's hand.
Then, cops say the couple told them, Sonnen flew off the handle, attacking Christopher and throwing him to the ground and hitting him repeatedly. Cops say Julie told them he then turned his attention toward her after she tried to intervene.
In the docs, the officers say Julie told them Sonnen threw her against a light fixture and socked her in the face. Christopher, according to police, told them the strike caused Julie's lip to split and bleed.
Cops say a witness on the scene told them security eventually arrived, but Sonnen punched the guard in the throat. Police say the witness was then attacked, with the man saying Sonnen elbowed him in the chest several times and shoved him.
In the documents, police say the fight was eventually broken up ... and when they questioned Sonnen about it all, they say the former pro fighter told them he "did not have memory of anything."
According to the docs, Sonnen told them he and his wife took a sleeping pill hours before the alleged altercation and he "could not recall anything else."
As we previously reported, Sonnen has since been hit with 11 charges -- including felony battery by strangulation -- over the incident. He's also been sued by the Stellpflugs, who claim they both suffered concussions in the alleged attack.
Sonnen has a hearing in his criminal case scheduled for later this week.