I agree with Nikita’s post. They made it into a horror movie, and AS a horror movie, it’s not that bad, but most of it isn’t even true, especially the 2nd half. None of it happened that way. Why someone would want to take a true crime story and change it up is beyond me. It’s not even necessary to make it.
If it’s the first movie you’ve seen about him, don’t watch it. Read the Ann Rule book first, then watch the other very good movies that are mentioned about him, or watch documentaries about him, but this is just a dramatization.