An Irish woman who was mysteriously found dead on a yacht in the US had reportedly been battling brain cancer.

Martha Nolan-O’Slatarra, 33, was discovered on a boat named Ripple at Montauk Yacht Club, Long Island, when a man called 911 around midnight on August 5, the Suffolk County Police Department said.

Despite ‘good Samaritans’ trying to perform CPR, first responders pronounced her dead soon after they arrived.

Officers asked Martha’s mum Elma, who was in contact with her daughter daily, if the claims were true she had been battling brain cancer.

Elma was reportedly stunned, telling investigators her daughter was ‘perfectly healthy’.

It is not known who told the authorities Martha had brain cancer, according to the Irish Independent. Her cause of death has still not been determine

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