(TMZ) The site where "Jackass" star Ryan Dunn fatally crashed his Porsche has been vandalized with the words "Ritch (sic) Pr*ck" -- and TMZ has obtained photos of the spray-painted desecration.
It's unclear who's responsible -- and according to West Goshen Police Capt. Joseph Gleason, it's difficult to track down any suspects because the roadside memorial is visited by so many people every day ... "At any given time you have 10, 20, 30 people there."
Gleason adds, police are aware of the vandalism and have been trying to remove it. The Westboro Baptist Church has protested at the site -- but denies responsibility for the vandalism. more on this story