A man with a gunshot wound was found in a Marina District doorway Saturday afternoon, said police.
The man was found at the intersection of Alhambra at Mallorca streets at around 2 p.m.
The victim, in his 30s or 40s, was found by police lying in a doorway. Police did not know he had been shot until the man was taken to a hospital for treatment.
He remained in life-threatening condition Monday.
No arrests have been made in the case, and police have not said where the shooting took place.