Employees testify in OSHA hearing into the death of a killer whale 's trainer . They testified that trainers are taught to recognize signs of aggression . Comment: In 2010 , Dawn Brancheau was pulled underwater by a killer whale and drowned .
Employees testify in OSHA hearing into the death of a killer whale 's trainer . They testified that trainers are taught to recognize signs of aggression . OSHA has cited SeaWorld for not having adequate safety precautions . In 2010 , Dawn Brancheau was pulled underwater by a killer whale and drowned .