Tilikum, a 23-foot male killer whale, killed his trainer Brancheau. Brancheau was one of the park's most experienced trainers.
Witnesses said that they saw the whale jetting towards Brancheau, violently grabbing her and shaking and thrashing her insanely.
The question is why was the whale with a trainer? This was not the first time this has happened. In 1991, the killer whale grabbed and drowned a part-time trainer. Later, after the death of the part-time trainer, security guards found a naked man in the pool with Tilikum.
Since this whale has such a bad background why would you continue training it? The whale was only meant for breeding not training.