That's a tuff one, isn't it? SMH.
Assuming that LE has got some indication that he was there, and that he did it or he most likely did it, then he ought to be boxed-in. Tire tracks that match his vehicle. Her fingerprints in his truck, but that would need other things to boost that along since they probably did go places in his vehicle. I'm hoping that he still had gunshot residue on himself when (if) they tested him, on his clothes, or his vehicle, etc. Of course he is a target shooter, too, so ...
If his clothes had her blood on them, that will really make it look bad for him - that would be a big deal, IMO. Her autopsy would show if she had any fresh wounds (not the bullet wounds) that would have bled. If they find the murder weapon in his car, that will really be tuff, IMO. Maybe she brought it along to shoot herself, the baby (if one), or him (worth a shot). Eight shots really complicates that scenario, IMO, however.
If any of this is the case, the defense will attack her and show why she made him go into some sort of fugue state and dissociate for a few days, thereby not responsible for what he did -- and he can't remember those few days before, during and after the incident. He was also having a hard time in his classwork, etc,. he was bullied, un-liked, etc., so he was really just plain pitiful. <gag>
They'll call in some psychological expert to show how it happened to the poor guy. <choke> I don't think they'll resort to schizophrenia unless things are really going south. There are experts for that, too. Of course the prosecution will have their experts as well.
Just my thoughts so far -- I'm convinced that he is guilty, of course, but I'm not yet convinced there will be a conviction. Money talks, b.s. walks. The defense team does not like to lose, and they have a lot of tricks, personnel, connections, and knowledge... And AFAIK, we haven't heard much or anything about the
prosecution, so that is an unknown for me, at least.