NILES, Mich. (AP) — Police say lab results show an 81-year-old man and his 55-year-old daughter whose frozen bodies were found inside their Niles home both died of hypothermia.

Police said Tuesday that Albert Bivins and Patricia Bivins “were found in a frozen state” on Jan. 3. The temperature inside their home was below 32 degrees Fahrenheit.

The deaths have been ruled accidental.

About a week before their bodies were found, the two had sought help to get their furnace fixed.