Ryan Dunn's passenger identified

Ryan Dunn, left, and Zachary Hartwell, right, were killed in a car accident near Philadelphia on Monday, June 20, 2011. The man in the middle is unidentified. Dunn tweeted this photo shortly before the accident

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Police identified "Jackass" star Ryan Dunn's passenger as Zachary Hartwell. Dunn and Hartwell were killed when Dunn's Porsche skidded off a road outside Philadelphia.

Dunn and Hartwell were killed when Dunn's Porsche crashed into the woods before bursting into flames. Police said they identified Dunn through his tattoos.

Autopsies were to be conducted Monday, though it was unclear when the results would be released.

According to court documents, Dunn was charged in April 2005 with driving under the influence after crashing his car in West Whiteland Township, about 2 miles north of Monday's crash site.

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