Actor Paul Walker died Saturday afternoon after a single-car accident and explosion, according to TMZ. The accident occurred in Santa Clarita, and according to multiple sources the actor was in a Porsche when the driver lost control and slammed into a post or a tree when the car burst into flames. It is unclear what caused the accident, or who was behind the wheel when it happened. The actor was in Santa Clarita for a car show to support the Philippines typhoon relief effort. A rep for Paul confirms he died as he was leaving the charity event. Paul was 40 years old.