Long Island prosecutors are trying to determine if “designer drugs” played a role in the mysterious Montauk Yacht Club death of f ashion designer Martha Nolan-O’Slatarra , Suffolk County District Attorney Ray Tierney said during an interview with The Post.

Investigators have not determined what killed the 33-year-old Irish woman, who was found unresponsive on a boat at the upscale club on Aug. 5, and are awaiting more autopsy results to conclude the probe, Tierney said Tuesday.

“Specifically, we’re talking about primarily, the toxicology — the official final toxicology report,” he said. “In our society right now, the way we’ve evolved with these designer drugs, all these substances that are created in a lab, you want to be extra careful that whatever testing you’ve done is comprehensiv

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