Fiji's Health Minister Dr Ifereimi Waqainabete confirmed authorities are still working to determine the cause of death and he can not release anymore information.
The family said that the healthy and active couple came down with a mysterious illness.
Calanog said the couple loved to travel and had been organizing the Fiji trip for some time: "They were planning an unbelievable vacation", she said.More news: Giant 'baby Trump' blimp returns amid protests in central London
Michelle is believed to have died first after they got sick some time between May 22 and 25.
"They were planning an incredible vacation", Calanog said.
Lockheed Martin spokesman Kenneth Ross confirmed with the Fort Worth Star Telegram their bodies have not been transferred to the United States yet and the company is "working with the family" to determine how to "support repatriating them".
The cause of their deaths is still under investigation.
Their "amazing vacation", however, turned into a nightmare when the parents of two - David and Michelle share a 2-year-old son and also raise David's daughter from a past relationship - came down with an unknown illness, sending them both to the hospital.More news: Trump state visit: Americans thank Royal Family for 'babysitting [their] garbage'
Representatives at the U.S. Department of State and the U.S. Embassy in Fiji did not immediately respond to PEOPLE's request for comment.
The Health Ministry has put in place necessary public health measures following the death of two American citizens in Nadi over the weekend.
To help with the investigation, the U.S. Centers for Disease Control and Prevention said it will be testing specimens from the couple.
Even if the remains are cremated the family will have something to remember them by.More news: 11.9 million Quest Diagnostics patient's personal info could've been exposed