Simons said she became well-versed in the park's training procedures and policies after Brancheau's death and while investigating policy came across a poorly executing training exercise that had taken place just weeks before the attack.
Some employees didn't respond at all during the drill, she said, and of those who did, many didn't follow protocol.
The report "was less than a page long, a timeline of when people responded. I asked where the critique was," Simons said. "They said that was not completed because the drill went so badly they were going to run another drill."
Thad Lacinak, former head trainer at SeaWorld and Brancheau's mentor told "Good Morning in America" in February that he believed Tilikum was interested in Brancheau's ponytail and that it was her mistake in violating protocol by laying in the pool with him.
"Dawn, if she was standing here with me right now, would tell you that it was her, that was her mistake in allowing that to happen," Lacinak said in February.
After Brancheau's death, Sea World barred trainers from being in the water with all of the killer whales.
People for the Ethical Treatment of Animals has now also gotten involved in the investigation and has called for Florida's governor to appoint a special prosecutor to go after Sea World for manslaughter.