LOS ANGELES -- Investigators sought to determine the cause of a fiery crash that killed "Fast & Furious" star Paul Walker while the 40-year-old actor's fans erected a makeshift memorial Sunday near where the Porsche he was riding in smashed into a light pole and tree.
The Los Angeles County Sheriff's Department said speed was a factor in Saturday's one-car crash, although it will take time to determine how fast the car was going.
Because Mr. Walker is so closely associated with the underground culture of street racing portrayed in the popular "Fast & Furious" film franchise, the fatal accident had an eerie quality -- a tragic end for a Hollywood hero of speed.
The crash also killed Mr. Walker's friend and financial adviser, Roger Rodas, according to Mr. Walker's publicist, Ame Van Iden. She said Mr. Walker was a passenger in the car when the two drove away in a 2005 red Porsche Carrera GT from a fundraiser in the community of Valencia, about 30 miles northwest of downtown Los Angeles.
Sheriff's deputies found the car engulfed in flames when they arrived at the site of the crash, near the fundraiser at Mr. Rodas' sport car dealership. Officials have not identified either person found in the car.
On Sunday, fans of Mr. Walker gathered to leave flowers, candles and memorabilia from the action movies.
Sheriff's Deputy Peter Gomez said investigators are working to determine how fast the car was traveling and what caused it to go out of control, including whether the driver was distracted or something in the road prompted him to swerve.
After the Porsche crashed into a light pole and tree at about 3:30 p.m., it burst into flames. The downed light pole had a speed limit sign of 45 mph.
Mr. Walker rode the "Fast & Furious" franchise to fame, starring in all but one of the six action blockbusters, beginning with the first film in 2001. He had been on break from shooting the seventh installment; production began in September and while much of the film has been shot, it's incomplete.
Universal Pictures has not said what it plans to do with "Fast & Furious 7," which currently is slated for release in July.
Mr. Walker and Mr. Rodas had attended a fundraiser benefiting victims of the recent typhoon in the Philippines. The event was held by Mr. Walker's Reach Out Worldwide, a charity he founded in 2010 to aid victims of natural disasters.
The fundraiser and toy drive took place at Mr. Rodas' custom car shop, Always Evolving. Attendees rushed to the nearby crash to try to put out the flames with fire extinguishers.
Bill Townsend, who attended the event, told Associated Press Radio that Mr. Walker appeared very happy at the fundraiser.
"He was smiling at everybody, just tickled that all these people came out to support this charity," Mr. Townsend said. "He was doing what he loved. He was surrounded by friends, surrounded by cars."
Mr. Walker left behind two completed films. He stars in the upcoming Hurricane Katrina drama "Hours," which Lionsgate's Pantelion Films is to release Dec. 13. He also stars in "Brick Mansions," a remake of the French action film "District B13" that Relativity plans to release next year.
Paul William Walker IV was born on Sept. 12, 1973, in Glendale, Calif. He was a child actor in television commercials and made appearances in TV shows including "Charles in Charge," "Who's the Boss" and "Diff'rent Strokes," according to his IMDB page. He also had a role in the soap opera "The Young and the Restless" before becoming a film actor.
He had roles in "Pleasantville" (1998), "Varsity Blues" (1999) and "She's All That" (1999) before appearing in the first of the "Fast & Furious" films in 2001.
"Fast & Furious 7" is due to be released in July 2014, according to the Universal Pictures website. Mr. Walker recently completed work on "Brick Mansions," which is scheduled for release next year, according to the IMDB.
Mr. Walker is survived by his 15-year-old daughter.
Bloomberg News contributed.