AP//Daily Local News
"It's Always Sunny in Philadelphia" stars Glenn Howerton, left, and Rob McElhenney attend a memorial service for Ryan Dunn, June 22, 2011, in West Chester, Pa.
Michael Buckner/Getty Images
Ryan Dunn attends the Blu-ray and DVD release of Paramount Home Entertainment's "Jackass 3" at the Paramount Studios on March 7, 2011, in Los Angeles.
Personal photo
Ryan Dunn, left, tweeted this photo in the early morning, Monday, June 20, 2011. Dunn was killed in a car accident outside Philadelphia around 3:00 a.m.
Michael Buckner/Getty Images
Ryan Dunn, left, and producer Trip Taylor attend the Blu-Ray and DVD release party for Paramount Home Entertainment's "Jackass 3" at Paramount Studios on March 7, 2011, in Los Angeles.
Michael Buckner
Ryan Dunn attends the Blu-ray and DVD release of Paramount Home Entertainment's "Jackass 3" at the Paramount Studios on March 7, 2011, in Los Angeles.
Frazer Harrison/Getty Images
Ryan Dunn arrives at the premiere of Paramount Pictures and MTV Films' "Jackass 3D" at the Mann's Chinese Theater on Oct. 13, 2010, in Los Angeles.
Frederick M. Brown/Getty Images
From left to right, Dave England, Preston Lacy, Ehren McGhehe, Ryan Dunn, Wee Man, Bam Marjera, Johnny Knoxville and Steve-O of "Jackass" pose in the press room during the MTV Video Music Awards at NOKIA Theatre L.A. LIVE on Sept. 12, 2010, in Los Angeles.
Christopher Polk/Getty Images
Johnny Knoxville, left, and Ryan Dunn of "Jackass" reenact scenes from "The Social Network" on Jan. 4, 2010, in Los Angeles.
Kevin Winter/Getty Images
Ryan Dunn arrives at the premiere of Paramount's "Jackass Number Two" at the Chinese Theater on Sept. 21, 2006, in Los Angeles.
Scott Gries/Getty Images
Bam Margera, left, and Ryan Dunn appear onstage during a taping of MTV2's "All That Rocks" at CBGB on July 6, 2006, in New York.
ShowBizIreland
Bam Margera, left, and Ryan Dunn from MTV'?s "Jackass" and "Viva La Bam" are pictured in the crowd as the band "HIM" plays the Olympia Theatre, Oct. 11, 2004, in Dublin, Ireland.
Scott Gries/Getty Images
Ryan Dunn appears on stage to promote his new show "Viva La Bam" during MTV's Total Request Live at the MTV Times Square Studios April 23, 2004, in New York.
Kevin Winter/Getty Images
Director Steven Green, Racer Ryan Dunn and producer Maximillion Cooper pose at the premiere of "Gumball 3000 - The Movie" on Feb. 19, 2004, at the Chinese Theatre, in Los Angeles.
