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walter killed lottie. this is not 100% confirmed, obviously, but i feel like after the scene with misty at his house in ep 9, it's the most plausible theory.
so, here's why i think he did it.
after nat died, we all saw how dependent misty was on walter. my theory is that after misty started being independent again (well, the misty version of independent), walter missed that and decided that the only way for the 'problem' to be 'fixed' was for him to kill another one of the yellowjackets and entice misty into the mystery aspect of the murder, OR, have her so upset by lotties death that she would fall back into the needing him.
that ia my theory, hope you like it.