Johnny Knoxville Visits Grave of Ryan Dunn

MTV's "Jacka--" star Johnny Knoxville made an uncharacteristically serious visit to the grave of his late friend Ryan Dunn this week.

Dunn was killed in a car accident at age 34 in June 2011. He was a stunt man and personality on "Jacka--" and was part of the crew for over a decade as they filmed numerous episodes, three films, and countless over-the-top stunts.

On Wednesday, Knoxville informed his Twitter followers that he had paid a respectful visit to Dunn's resting place in Brecksville, Ohio.

"We just visited Ryan's grave out in Brecksville," wrote the reality television star. "Was glad to see he has had many people coming by to visit. Xoxo"

Knoxville spoke at Dunn's funeral and penned an online tribute in the wake of the tragedy, but had rarely spoken of his friend since.

At the time of Dunn's death, Knoxville, as well as other "Jacka--" stars, released statements of mourning.

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

"I don't know what to say, except I love Ryan Dunn and I'm really going to miss him," said Steve-O.

Meanwhile, the parents of the passenger killed with Dunn in the car accident are suing Dunn's estate for reckless driving.

Zachary Hartwell was riding with Dunn, who was driving his Porsche at high speeds while under the influence of alcohol, according to TMZ. Hartwell was a production assistant on the film "Jacka-- Number Two."

George and Erma Hartwell, the parents of Zachary, are seeking compensation to cover expenses associated with their son's death including funeral costs.

The Hartwells are also suing the bar owners of Barnaby's of America for providing alcohol to Dunn who was "visibly intoxicated" ahead of the fatal car crash West Goshen Township, Pennsylvania.