The coach who was with Susan Taylor when she died swimming the Channel, said that "total fatigue" was the cause.
She had been swimming for more than 16 hours, covering 30 miles, when she collapsed in the water.
Donations to the charities for which she was fundraising have passed £60,000.
ITV News correspondent Juliet Bremner reports:
Two charities have been inundated with donations after a British woman's attempt to the swim the English Channel faltered in its final mile.
The English Channel is one of the world's busiest shipping lanes, used by hundreds of cargo vessels and ferries every day.