ORLANDO, Fla. - A SeaWorld killer whale seized a trainer in its jaws yesterday and thrashed the woman around underwater, killing her in front of a horrified audience. It marked the third time the animal had been involved in a human death.

Distraught audience members were hustled out of the stadium, and the park was closed.

Dawn Brancheau, 40, was one of the park's most experienced trainers. It was not clear whether she drowned or died from the thrashing.

A former contractor with SeaWorld told the Orlando Sentinel that the whale, Tilikum, is typically kept isolated from SeaWorld's other killer whales and that trainers were not allowed to get in the water with him because of his violent history.

There were conflicting accounts of the attack. The sheriff's office said Brancheau slipped or fell into the whale's tank, but at least one witness said the animal leaped from the water and dragged the woman in.

A retired couple from Michigan told The Associated Press that the killing happened as a noontime show was winding down, with some in the audience staying to watch the animals and trainers.

Spectator Eldon Skaggs said Brancheau was on a platform with the whale and was massaging it. He said the interaction appeared leisurely and informal. Then, Skaggs said, the whale "pulled her under and started swimming around with her." He said an alarm sounded and staff rushed the audience out of the stadium as workers scrambled around with nets.

Skaggs said he heard that during an earlier show the whale was not responding to directions. Others who attended the earlier show said the whale was behaving like an ornery child.

Another audience member, Victoria Biniak, told WKMG-TV the whale "took off really fast in the tank, and then he came back, shot up in the air, grabbed the trainer by the waist and started thrashing around, and one of her shoes flew off."

Two other witnesses told the Sentinel that the whale grabbed the woman by the upper arm and tossed her around in its mouth while swimming rapidly around the tank. Brazilian tourist Joao Lucio DeCosta Sobrinho and his girlfriend were at an underwater viewing area when they suddenly saw a whale with a person in its mouth.

The couple said they had watched the whale show two days earlier and came back to take pictures. But yesterday the whales appeared agitated.

A SeaWorld spokesman said Tilikum was one of three orcas blamed for killing a trainer in 1991 after she lost her balance and fell in the pool at Sealand of the Pacific near Victoria, British Columbia. Tilikum was also involved in a 1999 death, when the body of a man who had sneaked by SeaWorld security was found draped over him.

Brancheau worked with dolphins at Six Flags Great Adventure in New Jersey for two years before getting hired at SeaWorld, the Sentinel reported.

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