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Kenesha Antoine took to Facebook with the devastating news, sharing a video of the proposal - in which her boyfriend, Steven Weber Jr. swam underwater and held up a note to her.
Antoine and Weber were on holiday in Tanzania when the incident happened.
The note, had been placed in a water-tight ziplocked bag, read: "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 of the note, Weber asked Antoine to marry him.
The video shared by Antoine showed that she said yes, before Weber swam out of the frame.
It is not clear exactly how or why Weber drowned.
According to The Advocate, a U.S. State Department official said on Friday that the department was 'aware of reports of the death of a U.S. citizen in Tanzania'.
The official said: "We offer our sincerest condolences to the family on their loss. We stand ready to provide all appropriate consular assistance."
In a heartfelt tribute to her partner posted on Friday 20 September, Antoine wrote on Facebook: "There are no words adequate enough to honor the beautiful soul that is Steven Weber, Jr. You were a bright light to everyone you encountered.
"You never met a stranger, and you brought so much joy to so many people. You were kind, compassionate, you regularly made me cry with laughter, and you showered me with a love like none I'd ever experienced."
Antoine explained that Weber 'never emerged from those depths', meaning he never got to hear her answer - which was: "Yes! Yes! A million times, yes, I will marry you."
She continued: "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.
"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."
Antoine said Weber was her 'perfect love', adding: "I love you so much, and I always will."
Rest in peace.
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