Distraught audience members were hustled out of the stadium immediately, and the park was closed.
Trainer Dawn Brancheau, 40, a native of Northwest Indiana, was one of the park's most experienced. Her sister said Brancheau wouldn't want anything done to the whale that killed her because she loved the animals like children.
Brancheau was rubbing Tilikum after a noontime show when the 12,000-pound whale grabbed her and pulled her in, said Chuck Tompkins, head of animal training at all SeaWorld parks. It was not clear if she drowned or died from the thrashing.
Because of his size and the previous deaths, trainers were not supposed to get into the water with Tilikum, and only about a dozen of the park's 29 trainers worked with him. Brancheau had more experience with the 30-year-old whale than most.
Some of Brancheau's family still live in northwest Indiana. On Wednesday night in Schererville, Indiana where Brancheau grew up, her family celebrated her life.
At age nine after visiting SeaWorld, Brancheau told her mother she wanted to be trainer.
"When she got her interview at SeaWorld and she got hired, it was the happiest day in everybody's life in our famly. We are just very proud of her. She's been there for about 15 years," said Diane Gross, trainer's sister.
Brancheau's sister told ABC7 she understood the dangers of the job.
"The whales were like her children. She is married. She does not have children. She has nieces and nephews. She is the most favorite aunt," said Gross.
An 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."
A SeaWorld spokesman said Tilikum was one of three orcas blamed for killing a trainer in 1991 after the woman lost her balance and fell in the pool at Sealand of the Pacific near Victoria, British Columbia.
Steve Huxter, who was head of Sealand's animal care and training department then, said Wednesday he's surprised it happened again. He says Tilikum was a well-behaved, balanced animal.
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. The man either jumped, fell or was pulled into the frigid water and died of hypothermia, though he was also bruised and scratched by Tilikum.
At the stadium, what appeared to be a body covered with a black shroud could be seen lying on the concrete near the water as the animals swam just a few feet away.
Later Wednesday, SeaWorld in San Diego also suspended its killer whale show. It was not clear if the killer whale show has been suspended at SeaWorld's San Antonio location, which is closed until the weekend.
According to a profile of Brancheau in the Sentinel in 2006, she was one of SeaWorld Orlando's leading trainers. It was apparently a trip to SeaWorld at age 9 that made her want to follow that career path.
"I remember walking down the aisle (of Shamu Stadium) and telling my mom, 'This is what I want to do,"' she said in the article.
Brancheau worked her way into a leadership role at Shamu Stadium during her career with SeaWorld, starting at the Sea Lion & Otter Stadium before spending 10 years working with killer whales, the newspaper said.
She also addressed the dangers of the job.
"You can't put yourself in the water unless you trust them and they trust you," Brancheau said. Steve McCulloch, founder and program manager at the Marine Mammal Research and Conservation Program at Harbor Branch/Florida Atlantic University, said the whale may have been playing, but it is too early to tell.
"I wouldn't jump to conclusions," he said. "These are very large powerful marine mammals. They exhibit this type of behavior in the wild.
"Nobody cares more about the animal than the trainer. It's just hard to fathom that this has happened."
Gross said the trainer "would not want anything done to that whale." Gross said her sister loved working at the park and thought of the animals like she would her own children.
Mike Wald, a spokesman for the Occupational Safety and Health Administration office in Atlanta, said his agency had dispatched an investigator from Tampa.
Wednesday's death was not the first attack on whale trainers at SeaWorld parks.
In November 2006, a trainer was bitten and held underwater several times by a killer whale during a show at SeaWorld's San Diego park.
The trainer, Kenneth Peters, escaped with a broken foot. The 17-foot orca that attacked him was the dominant female of SeaWorld San Diego's seven killer whales. She had attacked Peters two other times, in 1993 and 1999.
In 2004, another whale at the company's San Antonio park tried to hit one of the trainers and attempted to bite him. He also escaped.
Wednesday's attack was the second time in two months that an orca trainer was killed at a marine park. On Dec. 24, 29-year-old Alexis Martinez Hernandez fell from a whale and crushed his ribcage at Loro Parque on the Spanish island of Tenerife. Park officials said the whale, a 14-year-old named Keto, made an unusual move as the two practiced a trick in which the whale lifts the trainer and leaps into the air.------
The Associated press contributed to this report.