THE death of a fashion designer found dead on a boat at a plush Hamptons yacht club remains shrouded in mystery - days after her body was found.

Martha Nolan-O’Slattara’s body was found on board the vessel, named Ripple, on Tuesday, but cops have not revealed her cause of death.

The circumstances behind the 33-year-old businesswoman’s death remain unknown, but Suffolk County cops found no evidence of violence.

The development came after the initial examination of her death was ruled inconclusive.

Cops swooped on the Montauk Yacht Club, located around 130 miles from New York City, after receiving a call about an unresponsive woman just after midnight.

Good Samaritans desperately tried to save Nolan-O’Slattara, who moved to the US from Ireland when she was 26, but they were unsuc

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