Quote:Another son of the couple found the bodies on Saturday night, the Springville Department of Public Safety said.

Preliminary autopsy results have ruled out any sort of violent assault.

"The Medical Examiner has indicated that the next step is to continue the investigation through analysis of blood samples to determine what may have caused the deaths," the Springville DPS said.

All five bodies were found in one bedroom of a duplex, CNN affiliate KUTV reported.

Firefighters entered the home wearing special equipment to test for carbon monoxide, but there was no indication of a buildup of the odorless poisonous, gas, Springville Police Lt. Dave Caron said.

The family had three pets -- a kitten, a full grown cat and a ferret -- who all survived, he said.