An obituary published online says 26-year-old Cassidy Rae Petit, and her fiancé, 27-year-old Lochie Ferrier, died on Jan. 14 when their plane crashed.
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Petit and Ferrier were just two weeks away from their wedding in Hawaii.
Isaac Zimmern, 27, and his partner Emma Pearl Willmer-Shiles were the other couple on board at the time.
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The National Transportation Safety Board said it had preliminary information that there were four people on board.
Initially, the Federal Aviation Administration reported there were only two people on the plane.
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Willmer-Shiles' body was recovered on Jan. 15 near the crash site.
Federal investigators say the small airplane was a home-built plane.
The cause of the crash is still under investigation.