Sailor Andrew 'Bart' Simpson was trapped underneath the boat and, despite attempts by doctors afloat and subsequently ashore, he was unable to be saved.
He was trapped under the platform for an estimated 10 minutes.
Simpson represented Great Britain at two Olympic Games, sailing in the Star class alongside Iain Percy.
The pair took gold at the Beijing 2008 Games and last year were close to topping the podium once more, only to be bumped down to silver in the medal race.
Before last summer's Olympics, Simpson admitted that winning the America's Cup was his biggest goal.
He had hoped that dream would come true as strategist for challenger Artemis Racing, whose sailing team director and tactician is close friend Percy.
More top news
Because shooting is permitted all year round dependent pups are left to starve if their mothers are shot, says charity.
Businessman Shrien Dewani has accused authorities of a "witch hunt" against him, in his first public statement in years.
Professor Stephen Hawking has revealed the 'one mystery' he finds most intriguing in the world is women.