LONGVIEW, Wash. -

State officials are revoking the operating license of a retirement facility in Longview, Wash., after an 88-year-old woman froze to death outside the facility this month.

The Longview Daily News reports that state officials say staff mistakes and ineffective security measures at Canterbury Gardens Alzheimer Care are to blame for Norma Sheldon's death Dec. 6.

The facility can continue to care for its current 57 residents while an appeal takes place but it can't accept new patients.

Canterbury officials say they're working to fix all of the state's concerns. They have 28 days to appeal.

Sheldon's body was found in an enclosed, open-air courtyard after staff missed a required, hourly bed check. The Alzheimer's patient was wearing only a nightgown in the 28-degree weather. She died of hypothermia.