Radar Police Reporter
Jackass star Ryan Dunn and his passenger, Zachary Hartwell, died of "blunt force and thermal trauma," the Chester County, PA Coroner tells RadarOnline.com.
Officials say both men died by the time emergency workers arrived at the scene.
The written autopsy report won't be released for at least a month due to toxicology tests being undertaken. These tests will determine if alcohol played a role in the accident
Police maintain that speed may have been a factor in the fiery crash which occurred in the early hours of Monday morning.