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PEMBA ISLAND, Tanzania (CNN) - A Louisiana man has drowned after proposing to his girlfriend underwater while the couple was vacationing in Tanzania. Weber proposed on Thursday by swimming underwater and holding a handwritten note against the bedroom windows, according to a video Antoine posted Friday on Facebook, before presenting a ring. But Weber failed to return to the surface, Antoine said in a subsequent Facebook post. "Our sincerest condolences, thoughts and prayers are with his girlfriend, families and friends impacted by this tragic accident," said Matthew Saus, the resort's CEO. The State Department confirmed that a US tourist had died in Tanzania but gave no further details.