Divers on Friday recovered the body of the final person who had been missing after a violent storm off the coast of Sicily sent a luxury yacht to the bottom of the sea, the Italian firefighter service said.

The discovery of the body, that of Hannah Lynch, the 18-year-old daughter of the British tech entrepreneur Mike Lynch, who also died in the yacht’s sinking, put an end to a wrenching search and to the slim hopes that any of the missing people might have survived.

Ms. Lynch, whose family owned the yacht, was the final person who had been formally unaccounted for since Monday after tragedy struck a group that had been celebrating her father’s victory in a high-profile fraud case.

There were 10 crew members and 12 passengers on board the 180-foot vessel, named Bayesian after the mathematical theorem around which Mike Lynch had built his technology empire. Fifteen survived.

The body of the ship’s cook, identified as Recaldo Thomas, was found on Monday, a few hours after a downpour hit the northwestern coast of Sicily, near the port of Porticello, where the yacht had been anchored at sea.

But it took several days to recover the bodies of the six passengers who were apparently trapped inside the yacht, which went down sometime after about 4 a.m.: Mr. Lynch and Ms. Lynch; Jonathan Bloomer, the chairman of Morgan Stanley International; his wife, Judy Bloomer; Christopher J. Morvillo, a lawyer at Clifford Chance; and his wife, Neda Morvillo.