Authorities say that a man whose body was found in Council Bluffs earlier this week died of carbon monoxide poisoning.

Nicholas Aaron McGrath's parents had been away for the weekend and found his body in their home at 17 Virginia Hill Road when they returned on March 24.

Investigators initially treated the home as a crime scene but told the family early on that they did not believe the death was suspicious.

An autopsy was performed at the State Medical Examiner's office in Ankeny and the medical examiner determined that the cause of death was carbon monoxide poisoning.

The sheriff says the source of the carbon monoxide appears to have been the furnace and the death is being viewed as accidental.