Carbon monoxide blamed in death of American couple at luxury Mexico resort

An American couple died after being treated for suspected food poisoning at a luxury resort in Mexico.
Initial reports attributed the deaths to an "undetermined substance" but the woman's family believes carbon monoxide poisoning from improper ventilation was responsible.
The couple fell ill over the weekend, went to a hospital for IV fluids, returned to their hotel and were found dead hours later.
There were no signs of violence on the bodies according to authorities.
Similar incidents involving carbon monoxide poisoning at resorts have led to other deaths of American tourists in Mexico and the Bahamas in recent months.