The family of a Hamptons fashion entrepreneur who died under mysterious circumstances at a swanky Montauk yacht club launched a tip line as the case remains open one year later.

Martha Nolan-O’Slatarra’s family has launched the site MarthaTipline.com searching for clues as they seek $50 million in a wrongful death suit against Christopher Durnan, the last person to see her alive.

“The family of Martha Nolan-O’Slatarra and their legal team are seeking information that may help their investigation into her death in Montauk,” says the tip site, which is set up by attorney Michael Bowe of Brithem LLP.

“Brithem’s legal team continues to investigate and is asking anyone with information to come forward,” the site says.

Nolan-O’Slatarra, 33, died on Durnan’s boat “Ripple” as it was docked at the Montauk Yacht Club on Aug. 5, 2025. She had been living in Manhattan but spending time in the Hamptons.

A man on the scene — who was not identified by name — had called authorities and told them he was in bed with the Irish-born beauty and was unable to wake her up, according to a Montauk Fire Department patient care report.

Durnan was reportedly spotted completely naked running down the yacht club’s dock and calling for others to “do something.”

The family said on its site it wants to hear from anyone who was at or near the club, or interacted with Nolan-O’Slatarra or Durnan the day prior to her death and the day her body was found.

“Even if you are unsure whether what you know is important, we want to hear from you,” the website says.

The website first hit the internet last month, shortly after the family had filed a $50 million wrongful death suit against Durnan — an insurance mogul who invested in Nolan-O’Slatarra’s swimwear fashion company East x East.

That lawsuit accuses Durnan of causing her death through assault, negligence and gross negligence.

Last year, Suffolk County police said that Nolan-O’Slatarra’s body “did not show evidence of violence” — but sources close to the family told The Post that an independent autopsy determined the opposite.

Medics detailed finding Nolan-O’Slatarra cold to the touch and turning purple while her mouth, chest and back of her head were covered in blood, according to the fire department documents obtained by The Post. 

Just days before her death, Nolan-O’Slatarra unblocked Durnan’s number on her phone after he accused her of fraud, and later texted her business partner and friend Dylan Grace that Durnan was harassing her.

Local police have provided no update in the year since her death and have requests for documents under the state’s Freedom of Information Law, citing an ongoing investigation.