NEW YORK - Universal Pictures has shut down production on Fast & Furious 7 indefinitely after the death of its star, Paul Walker.

The studio announced Wednesday the film would shut down "for a period of time so we can assess all options available to move forward with the franchise."

The seventh installment of the street-car-racing series had begun shooting in September. Though much of Fast & Furious 7 has been filmed, it's far from complete.

When Walker died in a fiery car crash Saturday north of Los Angeles, the film was on break for the Thanksgiving holiday. Shooting had been planned to resume Monday in Atlanta, but production was put on hold after Walker's death.

Universal had been trying to fast-track Fast & Furious 7 for a July 11 release, a date that's likely to be postponed. Universal hasn't yet announced any release-date change.

"Right now, all of us at Universal are dedicated to providing support to Paul's immediate family," the studio said in a statement, "and our extended Fast & Furious family of cast, crew, and filmmakers."

Walker died from injuries in the impact and subsequent fire when the high-powered Porsche driven by his friend crashed, according to autopsy results released Wednesday.

The actor died from the "combined effects of traumatic and thermal injuries," according to the autopsy report released by the Los Angeles County Coroner's Office.

At the wheel was Roger Rodas, Walker's friend, financial adviser, and co-owner of a professional racing team. The two died when Rodas' 2005 Porsche Carrera GT smashed into a light pole and tree, then exploded in flames.

Sheriff's investigators were still trying to determine why Rodas careered out of control. They have said speed was a factor in the one-car crash about 30 miles northwest of downtown Los Angeles.

Rodas was killed by the impact alone, the doctor who performed the autopsy concluded. Results of toxicology testing for drugs or alcohol will take an additional six to eight weeks.

The limited-edition Porsche was previously owned by IndyCar driver Graham Rahal, who has said it was difficult to drive. It is not just fast - it can hit 100 m.p.h. in less than 7 seconds - but also unforgiving in its handling.

Walker starred in all but one installment of the Fast & Furious franchise, which has been particularly lucrative for Universal. Fast & Furious 6, released in May, was the highest-grossing film in the series, earning more than $788 million worldwide.

Universal announced Tuesday it would donate a portion of the proceeds from the coming DVD, Blu-ray, and digital release of Fast & Furious 6 to Walker's charity, Reach Out Worldwide.

Walker, 40, founded the charity in 2010 to give first-response aid to victims of natural disasters. He hosted a fund-raiser for the nonprofit Saturday afternoon before the crash.