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.
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