[This is a startlingly good insight. Just what kind of person is this?]

Unfortunately the mechanics are the easiest to figure out here. I think that by having a solid idea of how exactly she died, we might be able to rule out some potential culprits.

Of course, if you have any good ideas on how to figure out a motive... I'm definitely open to it. You sound like you'd have a few thoughts. [Or maybe a lot of thoughts.]