Websep 20, 2021 · dawn brancheau was a sea world trainer who worked with various whales at sea world orlando. In 2010, she was tragically killed by tilikum, the largest killer. Webfeb 26, 2010 · todd connell videotaped seven minutes of footage which shows brancheau working with tilikum the killer whale. He told cbs affiliate wkmg, which is.