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"Jackass" star 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. Personal photo

(CBS) 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.

Pictures: Ryan Dunn of "Jackass," 1977-2011

TMZ identified Hartwell as the man on the right in the photo above.

The Associated Press reports Dunn and Hartwell were killed when Dunn's Porsche careened off the road, flipped over a guardrail and crashed into the woods before bursting into flames. Police said they identified Dunn through his tattoos.

Dunn, Bam Margera, Christopher Raab (known as Raab Himself) and Brandon DiCamillo, under the moniker CKY for "Camp Kill Yourself," started making videos that featured them skateboarding and performing stunts.

Dunn was working as a welder and at a gas station when Johnny Knoxville, a friend of Margera's through the skateboarding circuit, asked the crew to allow their videos to be part of the series "Jackass," which became a hit on MTV and ran from 2000 to 2002.

Perhaps Dunn's most famous stunt, in 2002's "Jackass: The Movie," involved inserting a toy car into his rectum and going to an emergency room, where he made up a story that he was in mysterious pain after passing out at a fraternity party. Dunn's X-ray from the hospital became a popular T-shirt for "Jackass" fans.

That first movie, filmed on a budget of just $5 million, went on to make more than $60 million in the United States alone. The most recent installment, released in 3-D in 2010, brought in $50 million on its opening weekend alone.

In a 2000 stunt, he dived into a tank at a raw sewage plant wearing flippers, a mask and a snorkel.

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. The documents show he successfully completed a program designed for first-time, nonviolent offenders that allows charges to be dismissed after defendants finish the program.

Film critic Roger Ebert set off an Internet firestorm by tweeting, "Friends don't let jackasses drink and drive." Read that story here.

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