Now, we all know Bette is high-key out of pocket so, she could have definitely stabbed Ramon. The blonde is at the end of her ropes by the season finale; she's her sister's scapegoat for pushing Cassie and her future is looking pretty murky — no one would be shocked if she finally snapped. Bette has proven that she's not afraid to do some dark and dangerous things to get what she wants, and she has the support of her ultra-rich family to keep her out of jail, so there's a fair shot that she's the culprit. But she doesn't really have a reason to want Ramon dead, so unless she was defending someone else, I don't see her being the murderer.