Olivia Wise was the 16-year-old who covered Katy Perry’s, “Roar,” after treatment options for a brain tumor, subsided. The teen wanted to leave something for her family, so that they could always hear her voice. Katy got wind of the girl’s battle and responded via video. Wise shortly after passed away, and Katy still remembers the teen, with a few words. Check it out after the gallery!