The West Goshen Township Police Department says officers found Dunn's 2007 Porsche 911 GT3 "off the road and in the woods."
Both Dunn and his passenger "died as a result of injuries sustained in the accident." Cops will release more information on the passenger once officials can positively identify the body.
Cops say "speed may have been a contributing factor to the accident."
An investigation into the crash is ongoing.
As TMZ previously reported, Dunn tweeted a photo of himself drinking with friends hours before the accident.