Jackass star Johnny Knoxville is sharing his thoughts following the death of his co-star Ryan Dunn. Knoxville Tweeted:

    "Today I lost my brother Ryan Dunn. My heart goes out to his family and his beloved Angie RIP Ryan, I love you buddy."

Dunn and an unidentified passenger were killed early this morning just outside of Pennsylvania after his Porsche smashed into a tree.

The 34-year-old actor had Tweeted a photo of himself with friends drinking at a party hours before the fatal wreck. Police have not determined whether alcohol was the cause of the accident.

Read what Jackass co-creator Jeff Tremaine had to say about Dunn's death ... after the jump.