The three American women who were found dead at a beach resort in Belize suffered “fatal exposure to carbon monoxide poisoning,” a new toxicology report obtained by WCVB determined.

The women -- identified as 23-year-old Koutar Naqqad, 24-year-old Imane Mallah and 26-year-old Wafae El-Arar -- were found dead at the Royal Kahal Beach Resort in San Pedro in February.