I've often wondered how many "black widow" murders there are out there, adjudicated or not.
I had an acquaintance who, I strongly suspect, was a victim of this syndrome. I heard from a relative that she was really, really upset when she found out afterwards that the house was in his mother's name, not his. This, while a natural reaction, was in addition to prior little things.
Cremated and refused an autopsy would seem to be key items, I guess.
Terry