The male victim was unloading or loading a vehicle on Pacific Avenue at Polk Street this afternoon around 3 p.m. when the incident occurred, according to Officer Albie Esparza.
He was standing between two parked vehicles when the truck behind him suddenly accelerated, pinning him against the other vehicle, Esparza said.
The victim, whose name has not yet been released, was taken to San Francisco General Hospital, where he died of his injuries. The truck's driver remained on the scene and is cooperating with police.
Investigators are still working to determine why the vehicle accelerated and whether charges are appropriate, Esparza said. The victim and driver may have been working together, Esparza said.
Anyone with information on this incident is asked to call San Francisco police at (415) 575-4444 or text a tip to TIP411 with SFPD at the start of the message.