I watched Blackfish last night a documentary that came about after an Orca killled it's Sealand trainer in 2010, it was the third human kill this particular Orca had made in his 27 years. There is no documented killing of a human by an Orca in the wild. This doc explores the mind of the creature and how some end up going crazy over time. A highly intelligent beast who's nature it is to roam the open water to hunt and kill not to be be kept in a swimming pool and perform to audiences for dead frozen herring.
The animal after the incident.