An investigator for the San Francisco medical examiner says the man did not have any identification on him and no one has called asking about him.
Meanwhile, the zoo is closed today with authorities planning try to figure out how a a 300-pound Siberian tiger named Tatiana escaped her enclosure, killing the man and injuring two other men.
The first attack happened right outside the tiger's pen.
The second attack took place near the zoo's Terrace Cafe.
The cafe is sealed off with police tape, but an Associated Press reporter at the zoo says there are no officials examining the taped off area.
Doctors at San Francisco General Hospital say the two men who were injured by the tiger are resting comfortably after being treated for claw and bite marks.