Kenesha Antoine wrote on Facebook Friday morning that her boyfriend, Steven Weber Jr., died during their trip to Tanzania while trying to pop the question underwater.
In photos and video of the proposal posted by Antoine, Weber holds up a letter in a plastic bag to the window of what appears to be a tourist boat.
The note reads on one side, "I can’t hold my breath long enough to tell you everything I love about you. But ... Everything I love about you I love more every day."
On the other side, it adds, "Will you please be my wife. Marry me???”
But, according to Antoine, Weber never made it to the surface to hear her answer, “Yes! Yes! A million times, yes, I will marry you!!” she posted on Facebook.
"We never got to embrace and celebrate the beginning of the rest of our lives together, as the best day of our lives turned into the worst, in the cruelest twist of fate imaginable," she wrote.
"I will try to take solace in the fact that we enjoyed the most amazing bucket list experiences these past few days, and that we both were so happy and absolutely giddy with excitement in our final moments together."
It's not clear how Weber died. A U.S. State Department spokesperson told The Advocate it was aware of the reports of the man's death and the department offered its condolences to the family.