The Exorcist has terrified audiences since 1973, but few know the story is true. For the first time on television, investigators expose shocking secrets about the real-life exorcism of a 13-year-old boy that inspired an iconic horror film. Jeff Belanger, Anthony D. Call, Kendall Chappell, Caden Conrique, David Conrique, Terry Cooper, Troy Dillinger Added on HBO 2023-06-27.