Jackass, Bam Margera, Johnny Knoxville, Steve-O and Ryan Dunn

Theo Wargo/WireImage

As news of Ryan Dunn's passing quickly spread, Johnny Knoxville turned to Twitter to express his grief.

"Today I lost my brother Ryan Dunn," he wrote upon hearing that Dunn had died today in a fiery car crash in Pennsylvania. "My heart goes out to his family and his beloved Angie. RIP Ryan, I love you buddy."

But Knoxville wasn't the only Jackass costar to use the social media site as an outlet to mourn.

"I love you Ryan. I'm gonna miss you bad," tweeted David England, while Jason "Wee-Man" Acuna added: "I miss you, bud. You were always a happy kick-ass dude!"

As for Steve-O, he shared a similar sentiment.  "I don't know what to say, except I love Ryan Dunn and I'm really going to miss him," he wrote.

While there's been no word yet from costar Bam Margera, his mother described Dunn as being "like a son" to her when discussing the accident with a local Philadelphia station this morning.

Earlier today, MTV released the following statement: "We're deeply saddened by the passing of a member of the MTV family, Ryan Dunn. Our hearts and thoughts are with his friends and family."

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