Ryan Dunn, who is best known for performing cringe-inducing stunts on the MTV show “Jackass,” has died in a car accident.  April Margera, the mother of Dunn’s friend and co-star, Bam Margera, confirmed to TMZ that the prankster and an unidentified passenger were killed in a crash in Pennsylvania around 3 a.m. on Monday. Dunn, 34, appeared on the Johnny Knoxville-led MTV series, in the films that came from the show and on the spin-off series, “Viva La Bam.” He recently began co-hosting the new G4 show, “Proving Ground.”

The reality star tweeted this photo of himself at a bar late Sunday.

Rest in Power Ryan…