I was thinking the same thing. Let's say it was an episode of rage, he injured her, even to the point of knocking her unconscious, and with serious damage to her body.
If he hadn't been so foolish, he could have called 911, and gotten some help for her, but no, he has to finish her off like that. Stupid and sickening.
I just hope she got in some good blows to him before she was finished.
I sure do wonder if these other cases at ASU and SLO have any connection to him...it doesn't seem that someone as seemingly cold-blooded as SP has never done something like this before.