Employees testify in OSHA hearing into the death of a killer whale 's trainer . OSHA attorneys called three witness -- all from SeaWorld San Diego , including the California park 's vice president . 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 . Comment: In 2010 , Dawn Brancheau was pulled underwater by a killer whale and drowned .