Jackass star Ryan Dunn has died in a horrific car crash in Pennsylvania, according to a report.

The daredevil, 34, found fame performing stomach-churning stunts alongside Steve-O and Johnny Knoxville on the MTV show.

According to TMZ.com, he was travelling in a car in West Goshen Township, Pennsylvania in the early hours of Monday morning when the vehicle spun out of control and crashed, erupting into a fireball.

The website reports Dunn posted pictures on the internet of him drinking with pals just hours before the fatal smash.

No further details were available as WENN went to press.