Employees testify in a trial into the death of a killer whale 's trainer . They state that trainers are taught to recognize signs of aggression . OSHA has cited trainers for not having adequate safety training . Sanford , Florida ( CNN ) -- In 2007 , Dawn Brancheau was pulled underwater by a killer whale and drowned .
Employees testify in a trial into the death of a killer whale 's trainer . They state that trainers are taught to recognize signs of aggression . OSHA has cited trainers for not having adequate safety training . In 2007 , Dawn Brancheau was pulled underwater by a killer whale and drowned .