"[I've] never seen a car destroyed in an automobile accident the way this car was... even before it caught on fire," he said.
According to officials, the Jackass and former Viva La Bam star's Porsche flew over a guardrail, smashed into a tree and then burst into flames after he lost control of his vehicle in West Goshen, PA.
The 34-year-old reality TV star had one passenger in the car, 30-year-old Zachary Hartwell -- Dunn's good friend who had also served as a production assistant for the second Jackass film -- who was also killed.
Dunn had posted an online photo which showed the pair drinking at a bar before the 2:30AM crash, indicating that alcohol may also have been a factor.
The two bodies were pulled from the wreckage and Dunn was reportedly quickly identified through his tattoos, however Hartwell's identity took longer to determine.
Bam Margera, Dunn's fellow Jackassand former Viva La Bam star, visited the crash scene on Tuesday and broke down in tears, completely overwhelmed with emotion.
"I've never lost anyone that I've cared about. He's my best friend. I was in Arizona when I heard... It's just not right. It's not right... It was the worst phone call I've ever gotten in my life, waking up to that," Margera said in a interview with Fox's WTXF affiliate in Philadelphia, adding he had sensed something bad had happened.
"I was with friends having the best time ever, and at 12:30AM, I just started punching out the windows of the rental van and ripping out the speakers, and I didn't even know why. I wasn't mad at anything or anybody."
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