Even as they await the results of toxicology tests, Long Island cops are on the hunt for the drug peddlers they believe supplied the fatal dose that killed a stunning Irish swimwear designer earlier this month , multiple police sources revealed to The Post.

Suffolk County homicide detectives suspect Martha Nolan-O’Slatarra’s Aug. 5 death was an accidental overdose , the sources said, noting a powdery white substance was found next to her body inside a boat moored at the exclusive Montauk Yacht Club.

Cops still don’t definitively know if the powder discovered near the 33-year-old beauty is heroin, cocaine, fentanyl, or a deadly cocktail of all three. 5

“[These dealers] may or may not have known [they were selling] poison to this girl, but that doesn’t matter,” a source told Th

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