but angry enough to kill even by accident
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So why do you think someone poisoned Emma if no-one murdered Lucy, Lizann?
I don't think it was an accident for reasons I gave earlier. At the moment it seems likely that someone intentionally hit Lucy hard over the head, possibly in an attempt to stop her from doing or revealing something. There's lots we don't know, so it's not possible to categorically say there was no motive yet.
Hopefully now that Christmas is out of the way, the Lucy investigation will come to the forefront of the show and we'll find out lots more about her life.