Ryan Dunn's death: Preliminary autopsy results in, photos of his last night out [pictures]

MTV and 'Jackass' star Ryan Dunn died in a violent car crash on Monday. Dunn's car veered off the road into the woods and burst into flames killing Dunn and his friend. Dunn's body was so badly burned that it had to be identified by his tattoos.

Based on preliminary autopsy results it's said that both Dunn and his friend died from blunt force trauma and the fire. It's hard to tell which actually caused their deaths, but both were dead when police arrived. Toxicology results which will determine if alcohol played a role in the accident will be released in 4 to 6 weeks. Until then, police say that speed was the primary cause of the accident.

Dunn was famous for his roles on MTV reality/prankster shows 'Jackass' and 'Viva la Bam.' Dunn leaves behind his parents, sibling, step-parents and step siblings, as well as a fiance.