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‘Jackass’ Ryan Dunn Cause Of Death -- Blunt Force And Thermal Trauma

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June 21 2011, Published 2:23 p.m. ET

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By David Sargeant

Breaking Celebrity News Police Reporter

Jackass star Ryan Dunn and his passenger, Zachary Hartwell, died of "blunt force and thermal trauma," the Chester County, PA Coroner tells Breaking Celebrity News.

Officials say both men died by the time emergency workers arrived at the scene.

The written autopsy report won't be released for at least a month due to toxicology tests being undertaken. These tests will determine if alcohol played a role in the accident