BRANDYWINE, Md. — The authorities told Dawn McCoy that her husband died of a heart attack.

But the Charles County, Md. woman was suspicious then, and she's even more suspicious now.

Word that police in the Dominican Republic are investigating three other mysterious deaths at a different resort within a week of each other has McCoy regretting she never got a second autopsy on her husband when she finally got his remains back to the U.S.

David Harris died in the Dominican Republic
Dawn McCoy said she had to pay nearly $20,000 to the doctor, the hospital, and the funeral home, to get her husband's remains back to the U.S.
Bruce Leshan

David Harrison, 45, died in July 2018. Nathaniel Holmes and Cindy Day of Prince George's County died together in their room at the Bahia Principe resort. 

Police blamed respiratory failure and fluid buildup on the lungs. They suggested it might have been caused by both Holmes and Day's history of high blood pressure.

RELATED: Another woman died at same Caribbean resort just five days before Prince George's couple's mysterious deaths

Pennsylvania psychotherapist Miranda Schaup-Werner died at the Bahia Principe five days before Holmes and Day. Her brother-in-law told Fox News that she got a drink from the minibar, sat down to take a selfie, screamed and collapsed.

"I didn't plan on coming back a widow," Dawn McCoy said, the tears rolling down her cheek at the thought of her husband's death. "I wasn't prepared for what was coming my way."

McCoy and Harrison had gone to the Dominican Republic to celebrate their anniversary last July. They were having a great time "in paradise."

But this time, after heading back to his room, Harris complained he felt terrible. He woke up in deep trouble. "He wasn't able to breath," said his widow. "He wasn't able to talk. He was sweating profusely."

RELATED: Prince George's couple on blissful vacation found dead in hotel room

She said it took a doctor 25 minutes to get to her room, and by that time, her husband was gone.

The Dominican death certificate lists Harrison's cause of death as pulmonary edema too, but also myocardial infarction (or heart attack) and arteriosclerosis.

David Harrison's death certificate from the Dominican Republic
David Harrison's death certificate lists his cause of death as pulmonary edema, myocardial infarction, and arteriosclerosis.
Bruce Leshan

Is it possible her husband just died from natural causes? "Honestly, I don't believe so," McCoy said. She said he had just had a complete physical workup, and his doctor at home found no problems.

McCoy said it cost her nearly $20,000 to get her husband's remains home. That included $3,000 for the doctor at the hotel and even more for the hospital and the funeral home.

When she finally got him back, 11 days after is death, she had him cremated. Now she thinks that was a big mistake.

Frank Felix Duran, a spokesman for the Dominican National Police, said finding the bodies of Holmes and Day at the same time raises questions. He said police are still waiting for the results of toxicology tests on the newly-engaged Prince George's couple.

We've yet to hear back any additional details from the police on the death of David Harrison.