Margot the Murderer

I believe that Margot subconsciously killed Francis n purpose. When you look at all the facts, she had plenty of motivation. She had probably cheated on Francis more than once, and she's never been the best of wives, along with her age catching up to her. None of this would matter if Francis were a coward, but after the most recent hunt, it seems he has changed. He's brave, and knows all of the previously stated things about Margot. He would probably be very willing to leave her and just get another wife, with him knowing that anyone would want to be with someone with so much money. I'm sure on the outside, Margot probably didn't mean to kill Francis, just save him, but this is probably just human nature. Most people try to help others in danger when they aren't, but knowing what she knows, she might've made a split second decision that split something else, which in this case was Francis' skull.