Authorities have made an arrest in the murder and sexual assault of a woman found dead in her Old Bridge apartment.

Middlesex County prosecutors say 40-year-old Caroline Beckert, of Old Bridge, is charged in the death of 70-year-old Jo Ann Cullinan.

Cullinan’s body was found Wednesday night in her unit at the Glenwood Apartments. Officials did not release specific details about the crime, such as how Cullinan was killed or how the two women knew each other.

Beckert is charged with murder, aggravated sexual assault and a weapons offense. She's due to make her initial court appearance on Friday.