I am strongly suspecting that we won't hear more. This is what, after all, is called mental illness, these invasive, horrible thoughts that kept him awake for a few nights. (Maybe he heard voices, too? We don't know). CD was either unaware of what it was, or too afraid of asking for help. (I wrote about the dichotomy between what medicine can do now and lack of awareness about its potential in the general population, and how things went downhill during COVID, and deleted it. We all know).
CD's attitude defies any understanding, but if we can imagine that it is how mental illness might present, it might fit the bill. Maybe it is drug-induced, too. If I were to guess, I'd say, primary, plus some substances on board, but too often street drugs are used to self-medicate already-existing problem, so it becomes mixed.
In a way, there is no worse punishment than simply treat him, and treat well. When he is clear, he'll understand what he did. And then, make an interview with him, to educate everyone. With numbers, and addresses where to call, should someone feel similar symptoms.
This case is a crying shame.