The cause behind the Bahamas Sandals deaths of three Americans was determined to be carbon monoxide poisoning, according to a new report.

New York Post reported that autopsy and toxicology reports have been completed after the deaths of Tennessee couple Michael Phillips, 68, and Robbie Phillips, 65, as well as Vincent Chiarella, 64, of Florida.

Before the autopsy, the three Americans were reported to have died under mysterious circumstances at the Sandals Emerald Bay resort on the island of Exuma on May 6 while staying in separate villas.

The three American victims were found unresponsive in their rooms after allegedly seeking medical help for feeling sick before the night they were found dead.

Chiarella's wife, Donnis, was shortly hospitalized due to carbon monoxide poisoning but recovered.

Prior to the released autopsy report, there has been speculations about the cause of their deaths, prompting an investigation into the food that was served.

Many guests have also complained that there was a strong odor of insecticides.

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Bahamas Sandals Deaths

The victims' families reportedly asked investigators last week to allow a pathologist from abroad to do a second autopsy, according to a Fox News report.

Bahamas Minister of Health and Wellness Michael Darville told reporters that toxicology reports are still "outstanding," announcing the want of the victims' families bring another pathologist from abroad.

Darville said he wants to "get to the bottom" of the investigation, with reports that the government will facilitate the request.

Possible leaks from the air conditioning and the water heater on the property are also being investigated.

Meanwhile, the commissioner was unable to say whether the victims' relatives were granted permission to bring in a U.S. pathologist to conduct another autopsy. Darville said that it was outside his authority.

Bahamas Commissioner of Police Paul Rolle said that they are actively engaging a lab in Philadelphia to assist them with expediting the toxicological examinations of all the samples, as reported by The Tribune.

Rolle added that their forensic experts have also collected samples from both of the rooms and the properties of the Sandals hotel in Exuma, whether or not there are contaminants present.

The Three Americans' Death in Bahamas

Rolle said in a USA Today report that the three Americans were all treated at different times and ate at different places.

The police commissioner earlier noted that they are checking what all of the victims ate and, hopefully, they will be able to determine whether it was food or something else that caused it.

Rolle said that the victims went to a doctor after complaining of feeling ill the night before their bodies were discovered.

Samples were collected from the body. The police commissioner previously said that they would not speculate on the cause of their deaths as police and health officials continue their investigation.

Meanwhile, authorities noted that they do not suspect foul play in the deaths or in Donnis' hospitalization.

The U.S. State Department said it was "closely monitoring" the investigation.

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Written by: Mary Webber

WATCH: Police name 3 US tourists found dead at Bahamas Sandals resort; woman remains hospitalized - from 6abc Philadelphia