Ryan Dunn may have been speeding before fatal car crash, say police

(CBS/AP) PHILADELPHIA - It wasn't a "Jackass" stunt that killed Ryan Dunn. It was a ride in his car, although police say he may have been speeding.

Police say Dunn's Porsche left the road outside of Philadelphia and burst into flames, killing Dunn and his passenger, Zachary Hartwell.

A few hours before yesterday's 3 a.m. crash, Dunn had tweeted a picture of himself drinking with friends. The photo has since been removed, but has been retweeted by many of his fans.

Autopsies were to be conducted yesterday. It's unclear when the results will be released.

Along with the "Jackass" movies and a film that hasn't been released yet called "Living Will," the 34-year-old was the star of his own MTV show, "Homewrecker," and had just began hosting the show "Proving Ground" on the G4 cable network.

Dunn may be most famous for doing a gag in the first "Jackass" film: Inserting a toy car into his rectum for a stunt called "Butt X-Ray.