John Heathco, 41, and Abby Lutz, 28, were found dead in their hotel room last week after previously being hospitalized for what they thought was food poisoning.
Authorities say Abby Lutz's and John Heathco's deaths were caused by an "unknown substance," but the paramedics who found them are also now hospitalized.
Workers at Mexico resort where American couple was found dead claim managers ignored complaints msn.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from msn.com Daily Mail and Mail on Sunday newspapers.
Both current and former workers at Rancho Pescadero in Mexico claim managers ignored signs of possible gas leaks and disabled carbon monoxide detectors because of the loud alarms.