The woman in the photo, Margaret Schilling , a patient of the Athens Lunatic Asylum.
On December 2, 1978, the woman disappeared, perhaps while playing hide and seek with a nurse who forgot to look for her. A search was conducted throughout the building, which was huge and filled with rooms with more than 2000 patients, but to no avail.
She was found only on January 12 of the following year. Some say that she was deaf and dumb and this prevented her from calling for help when she was trapped in a room, but what is more likely is that her mental disorders condemned her to death on that occasion.
The woman had died with her arms wrapped around her chest, and had remained on the same spot on the floor long enough to decompose. All that remained of her when her body was taken away was a stain that is visible even now despite numerous attempts to remove it.
This stain was recently analyzed by a team of forensic scientists to ascertain its origin, and it was actually discovered that it is biological in nature and was not created artificially. Attempts to erase it, however, have only accentuated it.