Jackass star Ryan Dunn died as a result of blunt force trauma and fire injuries, according to an autopsy into the stuntman's death.

Dunn and a passenger were both killed after the daredevil crashed his Porsche in Pennsylvania early on Monday.

The Chester County Coroner's office released the autopsy results for both men on Tuesday.

Officials have declared the car crash was so violent, it is impossible to determine if the two died from the impact or from the fire that engulfed the vehicle.

Toxicology results for both men, which will determine their alcohol levels at the time of the crash, will be released in four to six weeks, according to TMZ.com.