Lynne Spalding, 57, was missing for two weeks before her body was found Oct. 8 in a stairwell at San Francisco General Hospital.
The San Francisco medical examiner ruled out foul play, listing the death as an "accident" and noting she "was deceased for some days before being found," the San Francisco Chronicle reported.
Spalding's cause of death was listed as a "probable electrolyte imbalance with delirium" due to "complications of chronic ethanolism."
Her body had no indication of head injuries or other trauma that could have explained her loss of consciousness, the newspaper said.
Spalding checked into the hospital Sept. 19 to be treated for a urinary tract infection, and had exhibited disorientation and weight loss, friends and family said.
Interpol investigating stolen passports on missing flight
Teacher apologizes for showing sexual image of herself in class