Australian Instagram model Sinead McNamara, who died after being found twisted in rope on a Mexican billionaire's superyacht on Thursday, August 30, was reportedly 'working her final shift' before she was set to depart the boat and meet up with her mother and sister. The 20-year-old, a native of Port Macquarie on the New South Wales north coast, was found unconscious at the back of mining baron Alberto Bailleres' 93-meter long Queen Mayan IV, said to cost north of $190 million.

According to the Daily Mail, her body was first spotted by a passing fisherman who alerted the crew about the accident. She was in a critical condition at the time, and after the onboard doctor failed to revive her, she was airlifted to a hospital in Athens. But the injuries would prove too grievous, and she would not survive the journey.

McNamara's mother Kylie and older sister Lauren were mid-air on their way to Greece to see the 20-year-old when they were informed of the tragic news. She had even posted about the reunion on Facebook, writing, "5 days till I get to see you!!! Excitement is an understatement." The Instagram influencer's brother, Jake, confirmed her death, writing, "have unfortunately received the worst news of my life, (Sinead) has passed away."

Authorities do not suspect there was foul play involved in her death and currently believe that McNamara took her own life. However, they are not quite ready to rule out other possibilities, with a senior investigating officer telling the Sunday Times: "By the looks of it, she took her life. We expect the autopsy to verify this in the coming days."

While Bailleres was not present on the yacht at the time, the detectives apparently interviewed all 23 crew members and forensically examined the boat before granting it permission to depart on Sunday night. No crew member was detained for further questioning. 

An Instagram post that the 20-year-old had shared around two weeks ago added further credence to the theory that she may have taken her life. A snap of her posing on a quad bike in Monastiráki, Lasithi, Greece, was accompanied by a cryptic caption of: "My head is all over the shop today. [sic] Take me back to this where my only worry was not cracking my skull open." 

 

Tired little munchkin. Cliffs give me the best feeling in the world ⛰ pre ant biting of the gluteus maximus 👊🏽🌴🐜🔪💀

A post shared by Salt Bby 💦 (@sineadmcnamara) on Oct 3, 2017 at 2:37am PDT

And while details still remain scarce, her family similarly believes she died in a boating accident. In a statement, a spokesperson for Australia's Department of Foreign Affairs and Trade said that they are "providing consular assistance to the family of an Australian who died in Greece."

McNamara's friends have expressed their grief and condolences on social media, with one writing, "You lived life with no fear, and it's a blessing to have known you." Another similarly posted, "Everyone should take a page from Sinead's book - where she was meant to have a holiday in Bali that turned into a year and a half trip sailing across the world."

Australian YouTuber Alex Hayes, who was a friend of McNamara's, shared a tribute, via an Instagram story, to his 650,000 followers. "Life is so precious," he wrote. "Gone way too soon. Such a beautiful human being. Will cherish all our memories." 

 

Comfort at its finest 🐂

A post shared by Salt Bby 💦 (@sineadmcnamara) on Dec 19, 2016 at 1:40am PST

Authorities at the Port of Argostoli, an island off the east of Greece's mainland, are expected to provide an update on the investigation on Monday, September 3.