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Ryan Dunn.

Photo By Sean Gresens/MTV

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Ryan Dunn, Johnny Knoxville and Travis Barker on August 29, 2002.

Photo By Ron Galella/WireImage

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Angie Cuturic and Dunn at the premiere of 'Jackass: The Movie' October 21, 2002.

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Dunn at the UK premiere of 'Jackass: The Movie' on February 25, 2003.

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Dunn on February 19, 2004.

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Bam Margera and Dunn appear on 'TRL' on April 23, 2004.

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Dunn appears on 'TRL' on October 31, 2005.

Photo By Getty Images

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Dunn at the 2006 VMAs press forum on August 30, 2006.

Photo By Getty Images

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Dunn and Bam Margera on August 10, 2008.

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The cast of 'Jackass' at the 2010 VMAs on September 12, 2010.

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Dunn on March 7, 2011.

Photo By Getty Images