The late David James Paul and his wife Jane Michelle Canalog Paul.
Officials say the Pauls became sick between May 22 and May 25.
Loved ones of David and Michelle Paul said they were in a state of disbelief on Monday after authorities on Fiji's main island called to notify them of the couple's sudden death.
'Nobody is telling me what was the cause of the death and that's very hard for me, ' he said.
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The US Embassy in Fiji, who were contacted for comment by KVUE, didn't comment specifically on the couple's death, but said there has been warnings of a unsafe flu affecting the island nation.
A Fort Worth couple suddenly passed away while on vacation in Fiji after contracting a mysterious illness.
In the wake of their deaths, Calanog told KVUE the couple's bodies will remain on the island until it is determined that the illness is not infectious. According to Fiji Broadcast Corporation, the embassy said it is not aware of any specific public-health threat to the community. If it is, she said their bodies will have to be cremated.
According to reports, Michelle Paul is believed to have died first, with plans in motion to transport her husband to Australia for treatment, before he too died, possibly from developing pneumonia.
In addition to leaving behind their son and David's daughter, the pair also shared a dog named Zooey, who Calanog recently set out to find after she had been boarded at an unknown kennel before the couple's vacation.
Family members believe that David and Michelle may have contracted a deadly virus, as the Fiji government had issued warnings about a risky flu season in the region.