Yesterday, I looked at JC's FB page. Some people made comments, several months, and years ago, about if he-JC was feeling better. JC also had a few odd posts. I am not his FB friend so I couldn't see all if his page contents.
I read in the news, at one time, his parents had a restraining order on him, because they were afraid of him.
I wonder if he had temper outbursts, and was violent, in his past, but did not seek any help.
I also wonder....(it is possible).....if JC took Lyne home, and someone broke in and murdered Lyne, and stole her car, after JC was gone. I kinda doubt it...but it is possible.
edited to add: Kiro 7 has a list of interesting info.