Image Credit: Instagram

A 20-YEAR-OLD Instagram "influencer" has been found dead on a billionaire's luxury yacht in Greece.

Police have launched an investigation into the death of Australian Sinead McNamara, who promoted swimwear, underwear and skincare to her 21,000 Instagram followers.

A crew member reportedly found her hanging from the rear deck of the boat. Attempts were made to revive her but she fell into a coma and died while she was being airlifted to Athens.

 

Sunkissed little munchkin 🕊 W/ @ecotan

A post shared by Salt Bby 💦 (@sineadmcnamara) on

Ms McNamara had been working on the pounds 108 million Mayan Queen IV, owned by Mexican mining magnate Alberto Bailleres, 87, for four months.

It is unclear what type of work she was doing.

The vessel is now docked at Argostoli, on the island of Kefalonia, where interviews and forensic tests are being carried out.

 

The happiest of happy little mountain goats 🐐

A post shared by Salt Bby 💦 (@sineadmcnamara) on

Members of the Bailleres family had disembarked from the superyacht several days earlier and it had not been established last night whether Mr Bailleres was on the holiday.

Happy little 🍩

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Ms McNamara's death was greeted with an outpouring of grief online from friends and followers.

Her brother Jake described hearing about her death as "the worst news of my life