SAN FRANCISCO (KTVU and wires) -- A man allegedly fighting with another man over marijuana in San Francisco's Haight-Ashbury neighborhood on Thursday evening is suffering serious head trauma after he was knocked out by a punch to the face and subsequently hit his head on the ground, police said.
An employee at Haight Street Tobacco, located at 1827 Haight St. said the fight happened on the sidewalk just outside the store.
Police said the victim and the suspect, both described as men in their mid 20s to early 30s, were in a fight over the victim's marijuana on Haight Street, just east of Golden Gate Park.
At about 7:25 p.m., the suspect threw a punch, striking the victim in the face and knocking him out.
The victim fell to the ground, hitting his head on the cement, police said.
The suspect fled in an unknown direction prior to the arrival of police and has not been arrested.
Police said the victim was transported to the hospital with life-threatening injuries.
According to the Haight Street Tobacco employee, the store has video surveillance footage of area where the fight occurred and that they intend to hand it over to police to assist in the investigation.