Dunn 's blood alcohol level was twice the legal limit , police say . His Porsche was speeding up to 140 mph , police say . Dunn and his passenger died from ` ` blunt and thermal trauma , '' the coroner said . He also hosted `` Proving Ground , '' which premiered on the G4 channel on June 14 . Dunn was known for pranks and dangerous driving .
Dunn 's blood alcohol level was twice the legal limit , police say . His Porsche was speeding up to 140 mph , police say . Dunn and his passenger died from ` ` blunt and thermal trauma , '' the coroner said . Dunn was known for pranks and dangerous driving .