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.