That kind of reminds me of someone I used to know (not the killing part of this whole thing). I went to high school with a guy who was super bright, an excellent student, well-liked. and a really good guy. After his junior year he left the school we went to, a private school, to attend public school. Nothing wrong with that in itself, but it seemed odd at the time that he decided to switch schools at that point in in his academic career. Then late in his senior year, during spring semester, he dropped out of school altogether. That was really surprising considering how smart he was and how close he was to graduating. At some point after that, he attempted suicide. He was subsequently diagnosed with schizophrenia.
The last I knew of him, he was doing well on medication and was capable of living on his own (but with a great deal of family involvement). That was over 20 years ago, though. I hope he’s still doing well. I thought very highly of him.