( 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 . The red-bearded Dunn , 34 , was famous for his pranks and dangerous stunts on the show , which evolved into a successful film franchise . Hartwell worked as a stunt car driver on `` Minghads , '' a 2009 comedy directed by `` Jackass '' star Bam Margera and featuring Dunn , according to the Internet Movie Database . West Goshen , Police were called to the wreck scene on State Route 322 at 2:30 a.m. Monday , the police report said . `` Upon arrival , police located one vehicle off the road and in the woods that was fully engulfed in flames , '' the report said . `` Speed may have been a contributing factor to the accident , '' police said , although the investigation is in its preliminary stages . Dunn was driving the Porsche , which was registered in his name , police said . A photo of Dunn was posted on his Twitter account about two hours before the wreck showing him with a drink in his hand . Two men sitting with Dunn in the photo are not identified . The manager of Barnaby 's in West Chester confirmed that the photo was taken in his bar Sunday night . The bar is about a mile away from where Dunn was killed in a car crash . Manager Jim O'Brien confirmed that Dunn was drinking there . `` He did n't seem to be intoxicated at the time he left , '' O'Brien said . `` Ryan was not a hardcore drinker , at least not when he was here . '' O'Brien said Dunn was a regular customer and well known to his staff . `` He was a valuable person in our community and his death is a tragedy , '' O'Brien said . `` He will be missed . '' MTV issued a short statement through its Twitter account Monday morning : `` We 're deeply saddened by the passing of a member of the MTV family , Ryan Dunn . Our hearts and thoughts are with his friends and family . '' `` Jackass '' star Johnny Knoxville tweeted his message Monday morning : `` Today I lost my brother Ryan Dunn . My heart goes out to his family and his beloved Angie . RIP Ryan , I love you buddy . '' Dunn teamed up with `` Jackass '' co-star Steve-O for an episode of the NBC game show `` Minute to Win It '' that aired on June 8 . He also hosted `` Proving Ground , '' which premiered on the G4 channel on June 14 .
NEW : Dunn 's car was going about a mile , police say . Dunn , weeks , died in the crash with Zachary Hartwell , police say . Hartwell worked as a stunt driver in a Dunn movie . Dunn 's blood alcohol level will not be known for 30 .