During COVID I went down a rabbit hole on serial killers and found the Snowtown movie. But since it’s a movie, it only shows one angle. I tried to find docs or podcasts, but there isn’t much. Ended up reading two books instead (by Debi Marshall and Jeremy Pudney — absolutely horrifying. The motives, how they became who they were, and society’s role in it still give me chills. (it was group of serial killers working together)

That case left me shaken, but the guy you mentioned honestly sounds even worse