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SAN FRANCISCO – Marin County medical examiners confirmed Monday they identified a body found floating between Angel Island and Alcatraz last week as that of a Swiss citizen who apparently was thrown from a party boat last month. 

A spokesman said dental charts were used to establish the identity of Lionel Voillat, a 30-year-old resident of San Mateo on the Peninsula who was also a Swiss citizen. 

“He drowned,” commented the spokesman, who had reviewed the autopsy results from late last week. When the body was discovered Thursday afternoon, another agency representative said it seemed to have been in the water for several weeks. 

Since the Oct. 27 incident aboard the Red and White Fleet's Royal Prince in the bay, the Swiss man had been presumed dead. But his body wasn't discovered quickly, despite searches into the night by the U.S. Coast Guard in the area off Hunters Point where the incident occurred. 

The next day, another cruise participant named William Monaghan, 27, was arrested. Prosecutors said at least one witness saw the defendant argue with the victim and then pick him up and throw him over a deck railing.