I was just thinking what if Abby is the killer? Maybe she has finally lost it. She hasn't been so innocent. For example, Austin and EJ. Maybe she lost it when she felt she had to choose Ben. Since she can't be with Chad, she got jealous when she saw him with Serena and Paige. I love Chad and Abby together but I am starting to wonder. She just can't seem to stay away from Chad. Maybe????