Martha Nolan was an Irish expat and New York fashion designer – until she turned up dead on a 54-foot yacht at a luxe marina on Long Island’s East End.

Ten days later, her cause of death remains unknown – leaving friends, family and followers to ponder what exactly happened to her on Aug. 5.

According to Suffolk County police, forensic pathologists completed Nolan’s autopsy a day later. They found no signs of violence, but her final cause of death is pending additional investigation.

“The text messages may play a part in this, however, she’s going through a divorce, in some 60-year-old guy’s yacht, she may not have told anyone exactly where and what she was doing,” Giacalone told Fox News Digital. “Since ‘sources’ have said an overdose, maybe that will lead to the dealer, who can be prosecuted. One thing DA Tierney has done is prosecuted a number of dealers that have caused a death. That’s why publicly stating a drug overdose is not helpful to the future investigation.”

Nolan was the founder of East x East, a boutique fashion company focused on beachwear and sunglasses. It also offered a Montauk-themed hoodie, emblazoned with the slogan, “I only love you in Montauk.”

The yacht owner was reportedly an investor in Nolan’s business. At the time of her death, she was also going through a divorce from her husband, Sam Ryan.

Fox News’ Michael Dorgan contributed to this report.