“A faulty pool water heater was the source of carbon monoxide that killed an 11-year-old boy at a North Carolina motel last weekend and a couple who slept in the same room about two months earlier, police said Wednesday.”
http://www.enquirerherald.com/2013/06/12/2528678/police-pool-water-heater-cited.html
Anyone else puzzled why they didn’t find the cause the first time yet allowed the motel to remain open?
Actually it appears earlier investigations were incomplete: