Dunn's car was going faster than 100 mph.

'Blunt and thermal trauma' killed Ryan Dunn

'Blunt and thermal trauma' killed 'Jackass' star, coroner says

(CNN) -- "Jackass" star Ryan Dunn and a passenger in his car died of "blunt and thermal trauma" when the 2007 Porsche 911 GT3 crashed and caught fire on a Pennsylvania highway early Monday, according to the autopsy report released Tuesday.

Police identified Ryan's passenger as Zachary Hartwell, a 30-year-old West Chester, Pennsylvania, man who once worked in one of Ryan's movies.

West Goshen, Pennsylvania, Police Sgt. Joe Burt confirmed that accident investigators estimated Dunn's car was going faster than 100 mph.

Toxicology results, which should show if Dunn was intoxicated, will not be available for several weeks, according to the Chester County coroner's office.