California ? A 73-year-old woman became trapped in a bank when employees accidentally locked her in the building while she was looking over the contents of a safe deposit box.

Marian Prescher, who has diabetes, apparently passed out during the ordeal because she had not taken her medication with her. A cleaning person discovered her six hours later.

Prescher visited the Bank of America branch Wednesday and was given use of a privacy room to examine her valuables. Employees left her in the room when they closed the bank about 6 p.m.

“They forgot she was there,” sheriff’s spokesman Jim Amormino said.

Shortly after midnight, deputies received a call from a cleaning person who discovered the woman. Prescher was unconscious and cold to the touch when authorities arrived.

“She may have died,” Amormino said. “It just seems to be a terrible oversight.”

Bank of America said it was investigating.