The engaged Maryland couple whose bodies were found in a hotel room in the Dominican Republic died of respiratory failure, according to a report.

Nathaniel Holmes, 63, and Cynthia Ann Day, 49, were set to head home Thursday, the day they were discovered dead at the Bahía Príncipe hotel in the Playa Nueva Romana resort, news station WBAL reported.

No signs of violence were discovered in the hotel room, where several bottles of medicine to treat high blood pressure were recovered, officials said.

The autopsies ordered indicated they died from respiratory failure and pulmonary edema, but officials are still awaiting toxicology results, according to WBAL.

“It most likely indicates that there was some type of lung injury that led to basically leaking of the fluid on portions of the lungs that should be filled with air,” Dr. Robert Shesser with George Washington University told news station WRC-TV. “When that happens, people don’t get enough oxygen and can die.”

The couple who were set to be married checked into the hotel May 25 and photos on social media showed them enjoying activities on the open water.

“Boat ride of a lifetime!!!” Holmes posted to Facebook.

A statement from Bahia Principe Hotels said: “We are deeply saddened by the incident at one of our hotels in La Romana, Dominican Republic, and want to express our deepest condolences to their family and friends.”

The pair’s deaths come after a Delaware mom said she survived a savage beating while vacationing at a Dominican Republic resort in January.

Tammy Lawrence-Daley, 51, said the near-fatal assault left her with a broken nose, fractured hand, partial hearing loss in her left ear and her mouth “ripped apart.”