Oswald in the doorway: the blog of the Oswald Innocence Campaign, by Ralph Cinque

Heating Systems: 
• Of the estimated 58 Heating Systems-related fatalities in 2010, 88 percent (51 deaths) involved gas heating equipment. Natural gas heating equipment accounted for 33 percent 
(19 deaths) of all fuel types of heating system-related fatalities; liquefied petroleum (LP or propane) gas heating accounted for 47 percent (27 deaths); and an additional 9 percent 
(5 deaths) were identified as unspecified gas heating. Oil- (1 death) and kerosene-fueled (1 death) heating systems accounted for a combined total of 3 percent. Five additional 

fatalities (9 percent) were associated with heating systems, where the fuel type could not be ascertained from CPSC records. 

Those are some pretty small numbers. Only 51 deaths in the whole United States for a whole year, 2010, from CO leaks from gas heating equipment. 

I haven't found any statistics on this yet, but I suspect that income status plays a big role in the deaths, meaning that poor people, who skip inspections and routine service calls are the predominant victims. But, that certainly wouldn't apply to James Altgens and his wife. They remain on my list of suspicious JFK deaths. If they did die of carbon monoxide poisoning, we need to consider that it was deliberate, that there was sabotage involved.