The lifeless body of the sixth missing person, Hannah Lynch, is brought ashore by fire brigade divers, in Porticello, near Palermo, Sicily, Italy, Aug. 23. EPA-Yonhap Italian divers retrieved the body of British tech magnate Mike Lynch's 18-year-old daughter, Hannah, who was the last person still unaccounted for after the family's luxury yacht sank this week off Sicily.

Seven people, including Lynch himself, died when the 56-metre-long (184-foot) boat, the Bayesian, capsized during a fierce, pre-dawn storm on Monday off Porticello, near Palermo. Fifteen people survived, including Lynch's wife, whose company owned the Bayesian, and the yacht's captain. As the rescue operation came to an end, attention switched to the official investigation into the disaster.

The public prosecutor's office of Termini Imerese, headed by Ambrogio Cartosio, is looking into possible charges of negligent shipwreck and multiple homicide, judicial sources told Reuters. The captain James Cutfield and the other survivors have been questioned by the coast guard on behalf of prosecutors. None of them have commented publicly on how the ship went down.

So far, nobody has been placed under formal investigation. Cartosio is due to hold a news conference on Saturday. Hannah Lynch's body was discovered on Friday by divers who have been scouring the submerged vessel for the past five days.

The five other dead passengers were recovered on Wednesday and Thursday, while the body of the only crew member who died, on.