Manzo, his wife and two daughters were vacationing for the weekend at Monte Rio beach, sheriff's officials said.
His 10-year-old daughter was swimming when she became distressed, and Manzo went into the water to help her. However, Manzo became distressed in the water, and a local woman went in the water to help the two, according to the sheriff's office.
Guerneville resident Susan Rogers, 64, rescued the daughter safely but was unable to find Manzo after several rescue attempts, the sheriff's office reported.
Monte Rio Fire Chief Steve Baxman said firefighters headed to the beach, located off Bohemian Highway, around 5:20 p.m. When firefighters arrived, "A woman came up to us and said, 'My husband is missing,'" Baxman said.
Two firefighters jumped in the water and one immediately found the body of the missing man, Baxman said. He was brought ashore and efforts were made to revive him, without success. He was pronounced dead. It is unclear how the man drowned and Baxman said the water is only 10 feet deep in the spot where his body was found, just down the river from the main beach.
"We don't even know if he could swim," Baxman said.
Baxman said the man may have been in the water for more than 15 minutes before his body was pulled out.