A body discovered in a stairwell at San Francisco's main hospital was that of a female patient who disappeared from her room there more than two weeks ago, authorities said Wednesday as they continued to investigate how the woman got there and what caused her death.

San Francisco General Hospital Chief Medical Officer Todd May said at a news conference that officials were still awaiting confirmation of the woman's identity from the medical examiner's office. But he said hospital officials had enough information to conclude it was 57-year-old Lynne Spalding.

"What happened at our hospital is horrible," a visibly emotional May said. "We are here to take care of patients, to heal them, to keep them safe. This has shaken us to our core. Our staff is devastated."

The San Francisco Sheriff's Department provides security at the public hospital, which has more than 400 beds and serves about 100,000 patients a year. Sheriff's officials do not yet know how long Spaulding had been in the stairwell, part of a fire exit that has an alarm on it, is locked from the outside and exits onto hospital grounds, Assistant Sheriff Paul Miyamoto said.
Miyamoto said a member of the hospital's engineering staff found Spalding on Tuesday - 17 days after she was reported missing from her room at San Francisco General - while conducting a routine quarterly check.

"All of us are committed to learning what happened and insuring it never happens again," Miyamoto said.

David Perry, a friend of Spalding's who is acting as a spokesman for her family, called the news a "nightmare" and said city officials have a lot of explaining to do. Spalding's relatives and friends spent days "scouring the streets of San Francisco with flyers because we were under the assumption that San Francisco General had been searched and Lynn was not here," Perry said.

"Lynn Spalding died alone, in the stairwell, at one of the finest medical institutions in this country," he said. "I hear that the San Francisco Sheriff's Department initiated a search. Well, evidently it wasn't a very good one. I think there are a lot of questions to be asked."

Spalding was admitted to the hospital for an infection Sept. 19 and disappeared two days later. Friends say she was very thin, frail and on medication that could have made her confused.

Nurses were checking on her every 15 minutes and she disappeared in the brief time between those visits, May said.

Spalding's family filed a missing person's report with police, who have been investigating her disappearance.

The sheriff's department is conducting an internal investigation of its security measures at the hospital.