The Monster of Mangatiti is a 2015 English-language Documentary Biography movie written by John Banas and directed by Riccardo Pellizzeri and Philly De Lacey. Heather Walsh tells her story of the time she was an emotional prisoner of Bill Cornelius at his remote farm. The monster of mangatiti stars Greta Gregory, Mark Mitchinson, Flynn Allan, Mark Warren, Roz Turnbull, Greg Smith and Heather Walsh. It was released on 6th September 2015.