A post mortem report has revealed that the Olympic sailor Andrew Simpson from Sherborne in Dorset died from blunt trauma with drowning.
Mr Simpson won a silver medal at the Olympics last year.
He was killed while training for the America's Cup in San Francisco in May.
The city's Chief Medical Examiner found extensive bruises to his head and neck.
The boat he was on broke in two and capsized. He was trapped beneath the wreckage.
More top news
Thousands of music fans are heading to Devon for one of the biggest festivals of the year. Powderham Castle is hosting Radio 1's Big Weekend
The picture tells it all. There's a yellow warning for heavy rain for tomorrow but it's a different story for the rest of the Bank Holiday
Former Devon and Cornwall Police dog Sasha has given birth to nine pups - who will all get a chance to follow in her 'paw' steps