On April 15, 1997 the CBC's "Fifth Estate" aired an hour-long program based on Mr. Williams' book and research. He was also hired as a consultant to the program. The program achieved the highest rating in the "Fifth Estate's" 30-year history. Court TV purchased the "Fifth Estate" program a year later and it has since run hundreds of times on that cable network in the United States. Of Court TV is now defunct but there was another program on the subject just produced by Jupiter Entertainment from Knoxville, Tennessee for the Oxygen Network called “Killer Couple.”
With Mr. Williams collaboration, MSNBC made their own hour-long documentary, which began running in 2001 to equally good ratings.
HBO also produced a short segment for their “Autopsy” series and Law and Order created an episode loosely based on the story.
In 2005, Michael Sellers announced that he was making a film based on the Paul Bernardo and Karla Homolka story entitled “Karla”. Mr. Sellers had been an active B-movie maker based in Santa Monica for some years. The fury and flurry of publicity that greeted his announcement in Canada surprised him and gave he and his investors the false impression that the publicity would translate into sufficient ticket sales to justify the completion and release of the film. As the rights to “Invisible Darkness” were held by Peter Simpson of Norstar Filmed Entertainments and myself at the time, and a review of the first cut of Mr. Sellers “Karla” clearly demonstrated that those rights had been infringed, Mr. Sellers was caused to make substantial changes to the film as well as pay the rights holders - the author in particular - a considerable settlement. The movie was hopelessly confused, inaccurate and poorly made and had only a minor release in Canada before it disappeared into the DVD bin slush pile. The investors attracted to the project are not likely to invest in another Michael Sellers project.
Today, the author holds all the movie and television rights to Invisible Darkness, Karla: A Pact with the Devil as well as life story rights and is in discussion with producers about the making of a serious movie on the subject.