Walker killed by impact and fire
Fast And Furious star Paul Walker was killed by injuries from both the impact and subsequent fire when the Porsche his friend was driving smashed into a light pole and tree, according to a post-mortem examination.
The actor died from the "combined effects of traumatic and thermal injuries" according to a report released by the Los Angeles County coroner's office.
The 2005 Porsche Carrera GT was driven by Roger Rodas, who was dead from "multiple traumatic injuries" before the car exploded in flames, the autopsy said.
Results of toxicology testing will take another six to eight weeks.
Walker starred in all but one of the six Fast And Furious blockbuster films that glorified fast cars and dangerous driving.
Sheriff's investigators are still trying to determine what caused Rodas to career out of control. They have said speed was a factor in the crash which happened north west of downtown Los Angeles.
Meanwhile, Universal Pictures announced that it has shut down production for an unspecified time on Fast And Furious 7.
The seventh instalment of the street racings series started shooting in September and had been on a break for the Thanksgiving holiday.