If Justin is a heroin addict, and he was known to stay at their house for days at a time, I would bet that mom and her man are both heroin users too. Or in the least they are opiate addicts.. Pills, etc. before they left to walmart it sounds like there might have been quite a few people hanging out, kind of chaotic even.. This to me, along with the late hour, sounds like they were going to score dope. Quite possibly justin was counting on getting high, and was highly agitated.. Waiting. Previous post say he was volatile. So he is with Bella and the walmart trip seems like days, he is sick. Probably thinks he is somehow getting cut out of this dope deal, so the text to mom was his insane form of manipulation.. I don't know what he texted if it was a threat that he then acted upon but.. All I'm saying is there is a major drug use feeling in this story. Also I can imagine that 911 call, step dad got high already. That explains his behavior and when he says mom is upstairs distraught, she is actually fixing. Just a possibility, my opinion. Bella should have stayed with gma, but mom sees$$ and it's all about her. So sad about this I can't sleep...