The fashion designer found dead on a boat at a Long Island yacht club had “only trace amounts” of cocaine in her system, her family’s autopsy reportedly found, appearing to clash with a statement by cops.

Suffolk County authorities investigating the baffling case have said glamorous Martha Nolan-O’Slatarra , 33, most likely died of an overdose after her body was discovered on the boat, which was moored at the Montauk Yacht Club, on Aug. 4.

Police cited a white powdery substance near her body and “no signs of violence.” But they also have remained tight-lipped on further details, claiming they are awaiting the final results of their own official autopsy.

Nolan-O’Slatarra’s family meanwhile had a separate autopsy conducted on her body, and a source close to her relatives told the Dai

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