A different wikipedia page (about another of the people Tilikum killed) describes the incident differently. I have not investigated all the citations to explain

A different wikipedia page (about another of the people Tilikum killed) describes the incident differently. I have not investigated all the citations to explain the difference: Tilikum became an infamous whale after attacking and killing his trainer, forty-year-old SeaWorld staff member Dawn Brancheau. Tilikum grabbed her arm, scalped the woman, fractured her jaw and killed her by blunt force trauma, the result of which was a contentious and controversial legal case over the safety of working with orca whales and the ethics of keeping live whales and other marine mammals in captivity. https://en.wikipedia.org/wiki/Death_of_Keltie_Byrne https://en.wikipedia.org/wiki/Death_of_Keltie_Byrne