Pirro was flying a single-engine plane that went down near Barstow and Garfield Avenues on February 5th. He was killed on impact.
Investigators later determined the aircraft was taken from an airfield in the Bay Area community of Concord.
The cause of the crash remains under investigation.
Fresno County Coroner Dr. David Hadden told Action News -- Pirro had so much meth in his system he would have been incapable of controlling an airplane.