According to our sources, she was on a psychiatric evaluation hold.
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San Francisco police are investigating the incident and are expected to release a statement this evening.
Hospital officials declined to comment on the incident, but classified it as a medical death.
RELATED: San Francisco General Hospital announces security changes after body found
It's not clear yet where she was found, but this comes less than a week after the body of 76-year-old Ruby Lee Anderson was found in the stairwell of the hospital's power plant building on Wednesday.
There is no word yet on how Andersen ended up in a restricted area. Her family says she was suffering from dementia and living in Behavioral Health Center Residential Care Facility for the Elderly located on the property.
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Something similar happened five years ago. In 2013, Lynne Spalding's body was found in a hospital stairwell two weeks after she went missing.
Stay with ABC7 News for the latest details on this developing story.
ABC7's Matt Keller contributed to this report.