Exclusive | Detectives seeking designer-drug dealers in tragic death of Martha Nolan-O’Slatarra

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.

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

“Look at Matthew Perry’s dealer,” he said, referring to Jasveen Sangha, 42, who pled guilty to maintaining a drug-involved premises and distribution of ketamine involved in a death, and now faces 43 years in prison for her role in the “Friends” star’s death.

“With higher profile cases like this poor girl in Montauk, you’re going to see more and more of these dealers getting locked up.”

Prosecutors could “seek manslaughter or [criminally negligent] homicide charges” against the drug peddlers, the same source said. “There’s a slew of possession and trafficking charges, and they could decide to get [federal authorities] involved, which would mean more time in prison if these bastards are convicted.”

State legislators have introduced “Chelsey’s Law” that would give prosecutors more leeway when prosecuting dealers, by adding “drug-induced manslaughter” or “homicide by sale of an opiate controlled substance” to the books.

The bill is named for Chelsey Murray, 31, who died on Long Island in August 2022 after using fentanyl-laced heroin. Last year, her dealer, Jaquan Casserly, was sentenced to 10 years after he pleaded guilty to felony drug sale.

Nolan-O’Slatarra was found unconscious aboard a boat named Ripple at the ritzy yacht club around midnight. The vessel is one of at least two Grateful Dead-themed 54-foot Sea Ray craft owned by insurance mogul Christopher Durnan, sources previously told The Post.

Homicide detectives are waiting on additional toxicology test results before releasing an official cause of death for Nolan-O’Slatarra. A final report is expected back “by . . . early next month, at the latest,” said one source.

Arthur Aidala, the lawyer for Nolan-O’Slatarra’s family, did not return a call for comment.