The document, which was obtained by E! News, officially reiterates what the Los Angeles County coroner's office had determined earlier this month—that the Fast and Furious star died from the "combined effects of traumatic and thermal injuries."
The death certificate for Roger Rodas, who was driving the Porsche Carrera GT that crashed on Nov. 30, states, as previously reported, that he died from "multiple traumatic injuries."
The cause of the accident that claimed both men's lives is still under investigation.
Meanwhile, Walker's funeral was held on Saturday, Dec. 14.
Family and close friends of the late actor gathered to say their final goodbyes in a private service at the Forest Lawn Memorial Park Cemetery in the Hollywood Hills.
Later that day, about 200 people gathered at a soundstage on the Universal lot for another ceremony, at which Ben Harper sang a song in Walker's memory, a source told E! News.
"There was a lot of crying" at the service, which lasted about two hours, the source said. "It was just very sad."