Update 5 p.m.: Sad news. The unconscious man found in Union Square has died. He was identified as 43-year-old Manuel Gallegos of Fremont. We contacted the San Francisco Police Department to find out whether or not this is now a criminal investigation. We'll tell you more when we know more.
Update 9:30 a.m.: Good news: a relative has come forward to identify the man. "I do not know yet whether this person wants to talk to the media, or to release the loved one's name or other information," said Rachel Kagan, spokeswoman for SFGH.
Original story 8:30 a.m.: The San Francisco Sheriff's Department is asking for you to help identify this man who was found unconscious in Union Square on Saturday around 5 a.m..
The unidentified man was discovered with head injuries suggesting he possibly fell, said San Francisco General Hospital spokeswoman Rachael Kagan. He had no wallet or identification on him, and remains unconscious.
This man is in critical condition, and police have had no luck trying to contact his family.
He's 5-foot-10 white man, between 30 and 40 years old. He weighs about 165 pounds and has brown hair, brown eyes, and no tattoos or distinguishing marks, Kagan said.
When he arrived at the trauma center, he was wearing Levis jeans, black leather shoes, and no shirt. He was carrying a Jeep key and a silver house key.
The hospital released photos of the man on Sunday afternoon, hoping the public could help identify him.
Anyone with information is asked to contact the San Francisco Sheriff's Department at (415) 206-8063.