Andrew 'Bart' Simpson, 36, won gold at the 2008 Beijing Olympics and silver in last year's Games in London, both in the Star class.
Born in Chertsey, Surrey, he started sailing at the age of six with his father in Christchurch, Dorset, according to Tyler Sports Management.
Nicknamed Bart, he was awarded an MBE in the 2009 New Year Honours list.
A Foreign Office spokesman said it was aware of reports of the death of a British citizen and had contacted its counterparts in the United States.
More top news
It will be a frosty Christmas morning across the UK but any chance of snow is limited to the Scottish mountains.
Fainting dogs, dancing grooms and an attacker who picked on the wrong girl all featured highly in our most-read stories of the year.
Some dogs have been at the Battersea Dogs and Cats Home for more than a year. Can you make their Christmas and give them a new home?