One is upon learning that her son was implicated in this murder the Mother said that she was not surprised. Yet others that knew him were shocked thinking that he would never or could never to something like that. My read on that it was a personality change recently enough that only a mother or father would recognize.
Secondly, the FBI reported earlier this week that he did not fit any of their three known models for serial/mass murderers but perhaps a bit of all three.
No conspiracy theory here...just saying things are not right.