Johnny Knoxville, Bam Margera attend Ryan Dunn memorial

Johnny Knoxville and Bam Margera attended a memorial service for their late Jackass co-star Ryan Dunn on Wednesday.

Dunn died Monday after crashing his Porsche in West Goshen Township, PA. His close friend Zachary Hartwell, a passenger in Dunn's vehicle, also lost his life in the car accident.

The Jackass star was legally drunk at the time of the crash, with his blood alcohol level more than double the allowed limit.

More than 100 of Dunn's friends and family attended a 'celebration of life' service at the DellaVecchia, Reilly, Smith and Boyd Funeral Home in Westchester, PA last night, MTV News reports.

Margera was joined by wife Missy Rothstein and his parents Phil and April, who frequently starred with Dunn in skits for both Jackass and Viva La Bam.

It's Always Sunny in Philadelphia stars Rob McElhenney and Glenn Howerton were also in attendance for the ceremony, which is believed to have lasted more than four hours.

An obituary for Dunn posted on the DellaVecchia, Reilly, Smith and Boyd Funeral Home's website indicated that a public memorial is being planned for a later date.

Dunn's family has encouraged fans of the Jackass stuntman to donate to Garth Brooks Teammates for Kids, an organisation which facilities mentoring between athletes and underprivileged children.

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Watch April and Phil Margera discuss Ryan Dunn's death below: