A caretaker at a Gwinnett assisted living facility was arrested after hidden cameras showed her drop a wheelchair-bound woman on the floor, strangle her with her own shirt and hit her in the head, police said Friday.

Lisa Williams, 44, of Lithonia, was charged with two counts of exploitation of a disabled adult and one count of aggravated assault by strangulation, Gwinnett police Cpl. Deon Washington said.

Police found out about the alleged abuse when the victim’s son called detectives Wednesday.

The son set up cameras in the room where his mother was living after she told him she was being assaulted at the Personal Touch assisted living facility in Loganville, Washington said.

Cameras also captured Williams kick the victim in the legs, he said.

“[The victim’s] physical condition prevented her from being able to ward off such repulsive attacks,” Washington said.

Detectives are still reviewing surveillance footage and working to determine if additional people who live at the location may have also been abused, he said.

“We are disgusted and saddened that people who are tasked with caring for some of the most vulnerable people in our society would use that as an opportunity to do intentional harm to them,” Washington said.

Anyone with information regarding the case is asked to call the police department’s special victims unit at 770-513-5300.

Williams is in the Gwinnett County Adult Detention Center without bond.