I think Matt is the murderer because he seems ways too innocent. He's obviously fed up with all the supernatural problems and nobody ever has time for him so he decided to scare everybody and make them leave the supernatural alone. During the scene before Elena found Alaric, Matt was giving off a really creepy vibe in the kitchen and I totally thought he was going to attack and stab her. He would be the most random murderer but remember guys, it's always the quiet ones.
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