COLUMBIA, S.C. (AP) — A 63-year-old worker died in the public bathroom of a South Carolina department store, but her body was not discovered for four days, authorities said.

Bessie Durham, a janitor at the Belk at Columbiana Centre, was found dead Monday in a bathroom stall, Columbia police said. Her cleaning cart was outside the restroom.

Durham was last seen at work on Thursday, and her body was not found until shortly after her family filed a missing person report, according to Columbia Deputy Police Chief Melron Kelly.

The Lexington County Coroner’s Office said there were no signs that someone killed Durham or that she was using drugs. An autopsy is planned to determine her cause of death.

The store was open regularly over those four days, and Kelly said police are investigating to see whether anyone was negligent.

“We’re still working with the store to find out what their process is to closing down the store, inspecting the store and things of that nature,” Kelly said.

Belk did not return an email seeking comment.