Missouri –
“The generator was in an enclosed area…a breezeway between the garage and the home and the house, but it was an enclosed breezeway. The generator was in that breezeway, which allowed the carbon monoxide fumes to go into the residence…it’s crucial to never use a generator inside your home, basement, or garage or less than 20 feet from any window, door, or vent.”
Mother, son die by carbon monoxide poisoning – Daily Journal Online