MARATHON (CBS4) – A boating accident off the Florida Keys has left an 80-year-old woman missing and presumed drowned and forced seven others, including a child, clinging to their overturned boat and a cooler for nearly a day.

The U.S. Coast Guard said the group's pleasure boat capsized in rough water Saturday. They spent 20 hours in the water before being saved.

Those rescued have been identified as Jorge Alejo Gonzalez, 62, Tomasa Torres Gonzalez, 57, Jose Miguel De Armas, 40, Yunisleidy Lima Tejada, 25, and Fabiana De Armas Lima, 4, of Royal Palm Beach.  Elena G. Gonzalez, 52, and Juglar Riveras, 34, of Hialeah were also among the rescued.

Commercial fisherman David Jensen was boating with his cousin Roman Butters when he spotted the capsized boat.

"Probably 3-4 miles up ahead, it looked like there was something floating in the water. Once I got a little bit closer, I noticed there was a guy waving and I hollered down to mate Roman, I yelled down it looks like we got a sunken boat and I guy in the water," said Jensen. "After we got closer there was three people in the water."

Jensen and Butters tried to coax them closer to their boat.

"The one guy put the life jacket on and swam to the boat, the other two were scared and said they didn't know how to swim, they wouldn't swim to the boat," said Jensen.

Jensen alerted the Coast Guard, which found a 4-year-old girl and the three women holding on to a floating cooler.

One of the men told officials that his mother, Zaida San Jurjo Gonzalez, 79, drowned before help could arrive.

"He said he was trying to hold on, but eventually with the waves coming over, she couldn't keep her head up above water and he couldn't hold her up any longer," said Butters. "He said she drowned and he had to let her go."

The boaters weren't wearing life jackets when their craft capsized off Long Key in wavy, rainy waters on Saturday afternoon, Lt. Kara Lavin said.

"The weather was not favorable at all for boating over the weekend. It's also pretty amazing that the group was able to tread water for so long in those rough seas," Coast Guard Petty Officer Nick Ameen said.

Ameen says the child was suffering from hypothermia. She and a couple of other boaters were taken to Fisherman's Community Hospital in Marathon.

Monday evening, Juglar Riveras returned to his Hialeah home and spoke briefly with CBS4's Natalia Zea. He was severely sunburned and had large marks from jellyfish stings all over his legs and arms.

Linnette Gonzalez is part of the family, but was not there for the fateful boating trip off Long Key Saturday. She said her family is having a tough time coping with the loss of her grandmother, Zaida Gonzalez.

"My dad and my aunt aren't speaking very much about it. It's my grandmother- their mom," she said crying.

But Gonzalez takes comfort knowing her grandmother died...boating.

"I'm really sad, but it's one of her favorite pastimes, it was one of her favorite pastimes."

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