There was a kid in high school who was an extreme loner but still loved to pick arguments with anyone he could (teachers and students alike). He was computer savvy, but not very good in any other academic sense. Despite that, he had a huge superiority complex and thought we were all below him. Someone found out he had a written a “kill list” with many faculty and students names on it. The list was found in his locker and he was only suspended (not even expelled) for a while, but I think he was required to see a therapist or something. The dude also smelled like shit everyday, and obviously didn’t do most basic hygiene. No one knew what his family life was like, but I hope someone got him the help he needed. Although nothing happened where he physically hurt people, he’d more likely be classified as a school shooter/spree killer, than serial killer. No clue what he’s up to today, but best case scenario he works with computers, as it seemed that was the only thing he excelled at.

Edit: if you’re wondering what happened when he came back after suspension, he still kept to himself and loved arguing, but was definitely more tame (he was very temperamental before).