Walker died from multiple injuries

The LA County coroner said Walker's death resulted from "traumatic and thermal injuries".

A screen grab from CNN's report showing the wreckage of the fatal accident involving actor Paul Walker. Picture: CNN

LOS ANGELES - Fast & Furious actor Paul Walker died from multiple injuries in a weekend car crash, the Los Angeles County coroner said on Wednesday, as Universal Pictures suspended production of the seventh instalment in its lucrative car racing film franchise.

Walker, 40, was a passenger in a fiery one-car crash on Saturday in Santa Clarita, California, about 30 km northwest of Los Angeles, which also killed 38-year-old driver Roger Rodas.

(L-R): Actors Vin Diesel and Paul Walker and actress Jordana Brewster attend a Universal Pictures presentation to promote their upcoming film Fast & Furious 6 at The Colosseum at Caesars Palace during CinemaCon in April 2013 in Las Vegas, Nevada. Picture: AFP.

The coroner said Walker's death resulted from"traumatic and thermal injuries". While the coroner did not elaborate, thermal injuries are heat-related and are commonly burns.

Universal, owned by Comcast Corp, said filming of the big-budget action movie has been put on hold for an unspecified amount of time as it decides how to continue production without Walker.

"At this time we feel it is our responsibility to shut down production on Fast & Furious 7 for a period of time so we can assess all options available to move forward with the franchise," Universal Pictures said.

The film, which began production in September, is currently scheduled to be released in theatres on 11 July, 2014.

The coroner ruled that both deaths were accidents and said that the injuries occurred when the car struck a fixed object.

Both Walker and Rodas died "within seconds" after impact, coroner spokesman Ed Winter told the Los Angeles Times. Winter was unavailable for comment.

Surveillance video shows the red Porsche crashing into a utility pole and bursting into flames about a minute later, according to footage shown on CNN.

Walker became a symbol of street-racing and car culture in his role as law enforcement officer Brian O'Conner in the Fast & Furious series.

The actor, who played supporting roles in 1998's Pleasantville and 1999's Varsity Blues, was in five of the six Fast & Furious films about illegal street racing, heists and organised crime.

Walker also starred in the Hurricane Katrina survival drama Hours, which will be released on December 13, and the crime drama Brick Mansions, which is in post-production and will be released next year.