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Spoiler warning: This article reveals major plot details from The Conjuring: The Devil Made Me Do It (2021) and discusses the real case behind the movie.
The Conjuring: The Devil Made Me Do It takes Ed and Lorraine Warren away from haunted houses and into a murder case involving alleged demonic possession. But beneath the frightening visions and occult rituals, several details connect the movie to real people and events.
Some are based on reported history. Others are Hollywood inventions. Here are 10 details you might have missed.
1. Arne Johnson Was a Real Person
The movie’s central case is inspired by Arne Cheyenne Johnson, a Connecticut man who killed his landlord, Alan Bono, in 1981. Johnson’s case became famous because his defense attempted to argue that demonic possession explained his actions.
The film changes names and events for dramatic effect, but the real murder is the story’s foundation.
2. David Glatzel’s Exorcism Inspired the Opening
The movie opens with the Warrens trying to help young David Glatzel, whose family reported frightening behavior and suspected possession.
The real David and his family were part of the case that brought the Warrens into Johnson’s story. However, the supernatural explanations were disputed, and the reported experiences do not prove that a demon was involved.
3. Arne Really Was Dating David’s Sister
Debbie Glatzel was David’s older sister and Arne’s girlfriend. Their relationship is a genuine connection between the movie and the historical case.
Debbie supported Arne and later married him. Their relationship gives the film an emotional center beyond its horror scenes.
4. The Movie Changes the Landlord’s Name
In the film, Arne kills a landlord named Bruno. In real life, the victim was Alan Bono.
The killing occurred in Brookfield, Connecticut, in February 1981. Although the movie presents the event through a supernatural lens, the real crime became a legal case, not a proven demonic attack.
5. “The Devil Made Me Do It” Wasn’t Just a Movie Title
The phrase became associated with Johnson’s case because his defense sought to connect the killing to alleged demonic possession.
The movie uses that headline-grabbing idea as its central theme. But the real court did not accept possession as a legal defense, and the jury convicted Johnson of manslaughter.
6. Ed and Lorraine Warren Really Investigated the Case
The Warrens were involved with the Glatzel family and Johnson’s story. Their claims about what happened, however, were not universally accepted.
The movie portrays them as skilled investigators who uncover the hidden supernatural truth. Real-life accounts were more controversial, and the alleged possession was never scientifically established.
7. Isla the Occultist Is Entirely Fictional
Isla, the movie’s secret occultist, gives the story a human villain behind its supernatural events.
There is no established historical evidence that a woman named Isla orchestrated the real case. The curse, the witch’s totems, and the occult conspiracy are fictional additions designed to turn the legal case into a supernatural thriller.
8. The Katie and Jessica Murders Were Invented
The film introduces Katie Lincoln’s murder and Jessica’s disappearance as clues connecting the curse to other victims.
These events are not documented parts of the real Johnson case. They help the Warrens follow a trail toward Isla, giving the movie a detective-story structure that the historical case did not have.
9. The Courtroom Story Was More Complicated
The real defense attempted to use demonic possession to explain Johnson’s actions, but the judge would not allow that argument to be presented as a valid defense.
The film gives relatively little attention to the legal battle. In reality, Johnson was convicted of first-degree manslaughter and sentenced to 10–20 years in prison. He served about five years.
10. The Real Case Remains Disputed
One important detail the film doesn’t fully explore is the disagreement surrounding the Warrens’ account.
David’s brother Carl later challenged the possession story, arguing that the family had been misled. The Warrens and other family members maintained different accounts. These disputes show why the case should not be treated as proven evidence of the supernatural.
Final Verdict
The Conjuring: The Devil Made Me Do It borrows real names, a real murder case, and reported possession claims, then builds a fictional occult mystery around them.
The Glatzel family, Arne Johnson, Debbie, and the courtroom controversy connect the movie to history. Isla, the curse, and the linked murders are Hollywood creations.
That’s what makes the real case fascinating: the documented crime is real, but the supernatural explanation remains disputed. The movie gives us a terrifying answer. History leaves the question open.
FAQs
1. Is The Devil Made Me Do It based on a true story?
Yes. It draws on the 1981 Arne Johnson murder case and the Glatzel family’s reported possession claims. Much of the occult investigation is fictional.
2. Was Isla a real occultist?
No reliable historical evidence identifies Isla as a real person involved in the case. She is a fictional character created for the movie.
3. Did Arne Johnson really kill his landlord?
Yes. Arne Johnson killed Alan Bono in 1981 and was convicted of manslaughter. His defense’s possession argument was not accepted by the court.
4. Were Ed and Lorraine Warren involved in the real case?
Yes. They were involved with the Glatzel family and the possession claims surrounding Johnson’s case, though their interpretation of events was disputed.
5. Did a real curse cause the murder?
There is no verified evidence that a curse or demonic force caused the killing. The curse and occultist plot are fictional elements of the film.