Police find no indication of foul play . said preliminary autopsy results showed that the family may have died from carbon monoxide inhalation , police said Friday . The man had told police he was feeling sick , police say . Note : Preliminary autopsy indicates they may have died of carbon dioxide poisoning . About 500 people a year die of carbon monoxide poisoning in the U.S .
Police find no indication of foul play . The man had told police he was feeling sick , police say . Note : Preliminary autopsy indicates they may have died of carbon dioxide poisoning . About 500 people a year die of carbon monoxide poisoning in the U.S .