SAN PEDRO (CBS ) — Authorities Monday identified three men whose bodies were discovered near a capsized boat off one of the Channel Islands.

Three bodies were discovered by a U.S. Coast Guard helicopter crew near Santa Cruz Island’s Platts Harbor Sunday, according to Lt. George Kolumbic of USCG facility in San Pedro.

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A fourth boater was spotted face-down in the water, but was gone when the recovery boats arrived, Kolumbic said. Six members of the Santa Barbara Sheriff’s Dive Team searched for him Monday.

According to the Santa Barbara Sheriff’s Office, the men whose bodies were recovered were: Sieng Sophorn Bun, 37, of Oxnard; Edgar Allen Isnec, 54, of Port Hueneme; and Ramiro Alvarez Duarte, 52, of Oxnard. The identity of the fourth man, whose body was still missing, was not released.

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The four men launched from Channel Islands Harbor Saturday morning in a 24-foot Grady White boat and were expected to return from their fishing trip Saturday night, Kolumbic said. None appears to have been wearing a life jacket.

The bodies were recovered Sunday afternoon. The reason the vessel capsized was not immediately determined. A joint investigation was being conducted by the Santa Barbara County Sheriff’s Office and the U.S. Coast Guard.

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