- NEW: Burned rubber and donut marks found at site of crash
- Speed was a factor, the sheriff's office says
- Walker was passenger in friend's car; both died
- Seventh "Fast & Furious" movie due next year
Santa Clarita, California (CNN) -- Actor Paul Walker, who shot to fame as star of the high-octane street racing franchise "Fast & Furious," died Saturday in a car crash in Southern California. He was 40.
Walker's publicist Ame van Iden confirmed his death, but said she could not elaborate beyond statements posted on Walker's official Twitter and Facebook accounts.
Walker was a passenger in a friend's 2005 Porsche Carrera GT and both were attending a charity event for his organization, Reach Out Worldwide, in the community of Valencia in Santa Clarita, about 30 miles north of Hollywood.
The website for the charity said the Saturday event was intended to benefit victims of Typhoon Haiyan in the Philippines.
Speed was a factor in the crash, the Los Angeles County Sheriff's Office said.
The wreck took place about 3:30 p.m. (6:30 p.m. ET), about 300 yards from the office park where the event was held. The speed limit there is 45 mph.
Up and down the road near the crash site were burned rubber and doughnut marks as though someone smoked their tires in figure 8 patterns.
"I don't know if the marks in the road are related to the crash," said Los Angeles County sheriff's Sgt. Brian Allen.
Deputies arrived at the scene to find a vehicle on fire, he said
Once fire crews put the flames out, they found two occupants, both of whom were pronounced dead at the scene.
Saturday evening, all that remained was the burnt mangled metal of the red car and a light pole that had been knocked down.
The county coroner said that, given the condition of the bodies, it will take some time to definitively identify them.
Hollywood left stunned by Walker's death
Box office success
Walker's career began on the small screen, first with a commercial for Pampers when he was 2, and then with parts in shows such as "Highway to Heaven" and "Touched By An Angel."
His first few movie roles were as supporting characters in teen flicks, most notably in "Varsity Blues."
His career really took off when he was cast as undercover cop Brian O'Conner infiltrating a street-racing gang in 2001's "The Fast and the Furious."
The box-office success of the surprise summer hit yielded numerous sequels. And along with Vin Diesel, Walker was one of the franchise stalwarts.
At the time of his death, he was working on the seventh film of the franchise, due out next year.
Walker wasn't just a car enthusiast on the silver screen, off-screen, the actor competed in the "Redline Time Attack" racing series.
On his verified Twitter account, Walker described himself as "outdoorsman, ocean addict, adrenaline junkie ... and I do some acting on the side."
Walker also is the star of "Hours," an independent film scheduled to be released December 13 about a father struggling to keep his newborn infant alive in the aftermath of Hurricane Katrina in New Orleans.
Twitter and other social media exploded with reactions to Walker's death.
"Completely numb and saddened to hear of the tragic death of Paul Walker," wrote one.
Hollywood condolences came from Will Smith, Jack Osbourne, DMX and others.
"No, @RealPaulWalker. No. No. No," tweeted actress Alyssa Milano. Walker guest-appeared with her in the 80s comedy, "Who's The Boss?" "Rest with the angels. You. Sweet boy. #beauty #love #RIP."
He is survived by his 15-year-old daughter, Meadow.