The report from the L.A. County coroner's office says that Walker's friend, Roger Rodas, lost control of the 2005 Porsche Carrera GT "for unknown reasons" as it sped east on Hercules Street in an industrial area of the city known for attracting car enthusiasts. The car spun and drifted south, its driver side smashing into a curb, then a tree and a light pole before it spun 180 degrees, hit a second tree and burst into flames.
FOR THE RECORD:
An earlier version of this article said that the Porsche hit a tree, a light pole and then a second light pole before bursting into flames. The car hit a tree, a light pole and a second tree.
Walker and Rodas were killed almost instantly, succumbing to multiple traumatic injuries and a fire that quickly consumed the car.
Walker died of "severe blunt head, neck and chest trauma," sustaining a
Rodas suffered similar injuries and a fractured skull.
The force of the crash almost split the vehicle in half, according to the report. Both men's bodies were found braced for impact in a "pugilistic" stance, the report added.
The limited-production car is notoriously challenging to drive, even for professionals, and it remains unclear why Rodas lost control.
The car is capable of reaching 100 mph in less than 7 seconds. It was built without the stability management system with which most Porsche models are equipped.
Porsche engineers are scheduled to visit Los Angeles this month to help detectives with the Carrera GT data-retrieval system, L.A. County Sheriff's Capt. Michael Parker said.
Walker was one of the main characters in the "Fast and Furious" movies and died amid production for the seventh film in the franchise. Universal Pictures has announced that Walker will still appear in the movie when it is released in 2015. He was in Santa Clarita for a charity event at the time of the fatal crash.