That's not something you should ask me about; I really don't care who the culprit is, so you can go ahead and find them yourself. Then again... even though some might think otherwise, I'm needlessly cruel. But I have to be, in my position.

If you talk about it from an emotional standpoint, out of the ones who could have killed her, it's probably someone who either didn't have any emotional attachment to her or disliked her. Although the latter was probably not all that difficult to achieve, I feel.

But... it would probably be easier to tell you who's more likely to not do it than to do it. Out of the group, I'd say Ein probably wouldn't have done it, just based on his personality alone. He didn't even understand the joke I made about his right hand.