I don’t know about the photo.
The report was that locals took Stevens to a hospital in Benghazi because he was still alive. The report was that he died in the hospital.
I read the book by the Benghazi heroes and they describe how he was found dead of smoke inhalation in the compound (they tried forever to get him out but couldn’t find him). So if the Libyans “violated” his body he was already gone.