IOWA CITY, Iowa (AP) – An investigator says it’s unclear what caused the fire that destroyed the car in which a prominent Iowa developer was found dead Sunday.  Ron Humphrey of the Iowa Fire Marshal’s Office says investigators found no definitive evidence in the burned-out Honda Accord where Bob Knapp’s body was found in rural Guthrie County.

Investigators are looking into what caused Knapp’s death and the vehicle’s fire. Humphrey says preliminary testing indicates Knapp didn’t die of carbon monoxide poisoning. He also didn’t have gunshot wounds.

Knapp left prison last week after serving about 2  1/2 years for conspiring to mishandle the removal of asbestos from a Des Moines building he was renovating. The next day, he borrowed a friend’s car so that he could check in with his parole officer. He never returned.