Their remains were flown back to the U.S. on Tuesday, the family attorney, Steven Bullock confirmed to USA TODAY. He also told People and ABC News that the family intends to have its own autopsies performed prior to burial.
“The families are determined to find out what happened and why. At this time the cause of death remains a mystery,” he told the outlets, adding that they look forward to getting the findings of the FBI, which was brought in by the U.S. Embassy in Santo Domingo and the Dominican Republic's Ministry of Tourism to conduct a "deeper toxicology analysis. The FBI's report will take several weeks to complete.
The Ministry of Tourism said Wednesday that the country's national police are and "working diligently to complete the investigations and to keep the public informed as new findings arise." Police are are also liaising closely with the FBI and Centers for Disease Control.
Dominican Republic deaths: Caribbean country faces tourist backlash after David Ortiz shooting, multiple deaths
According to CNN, autopsies performed by the Dominican National Institute of Forensic Sciences determined that Holmes, 63, and Day, 49, died of respiratory failure and pulmonary edema, which is caused by excess fluid in the lungs.
The cable news network noted that in addition to finding fluid in their lungs, preliminary autopsy results revealed each had internal bleeding. Holmes was found to have an enlarged heart and cirrhosis of the liver while Day had fluid in her brain.
In addition, a spokesman for the Dominican Republic National Police told CNN blood pressure medication was also found in their room at the Grand Bahia Principe Hotel in La Romana.
A 41-year-old Pennsylvania woman, Miranda Schaup-Werner, died May 25 after drinking from the minibar in her room at the Luxury Bahia Principe Bouganville, also part of the same chain.
In a statement issued Wednesday, the Dominican Republic's tourism minister, Francisco Javier Garcia, said, “All visitors are very important to us. The Ministry’s most important responsibilities are to ensure that the highest industry standards are met so that all tourists are safe when visiting. At the same time, it must also work to provide a definitive answer to the afflicted families."
He added, “You can also be sure that the necessary measures will be taken to make the country even safer for all visitors.”
This article originally appeared on USA TODAY: Bodies of Maryland couple who died at Dominican Republic resort returned to US