You're assuming she wasn't already dead when the "stager(s)"arrived.
That then is your drawn conclusion (which is not mine). I don't even assume it was a "murder". I never use that word in connection with this.
That's fine. I never ask anyone to agree with me. I just point out the possibilities, and why it is that you can't eliminate this as one of them.
It's not a matter of trying to find blame with anyone, or using someone as a "scapegoat". And if true, I don't think he should be prosecuted or punished any more than he already has been. This is simply a discussion forum -- for adults! And adults should be able to look at this and at least recognize the possibility without simply excluding it because it makes them uncomfortable.
And as for the word "psychopath"... I'm afraid I'm not qualified to throw that one around, so I'll leave it for others to decide.