Authorities investigate whether Martha Nolan-O’Slatarra died of ‘designer drug’ overdose

Long Island prosecutors are trying to determine if “designer drugs” played a role in the mysterious Montauk Yacht Club death of fashion 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 comprehensive and complete before you make any findings in the case.

“Oftentimes it’s not just one substance,” he added.

Nolan-O’Slatarra, who migrated from Ireland in 2018, co-owned swimwear company East x East and summered in the Hamptons, where she was featured in pop-up fashion shows.

Police responding to a 911 call found her on a boat named “Ripple” at the club, where she was pronounced dead after CPR attempts by bystanders failed to revive her.

There have been no arrests in the case, nor have prosecutors suggested foul play.

A funeral for the designer is scheduled for Wednesday in her hometown of Carlow, a small Irish village about 50 miles from Dublin.