Why She's the Killer:
- It's obvious that Claire isn't being completely honest with her son. After she suspects that he is lying to her about his relationship with Ava, she orders campus security to put extra surveillance on her son. When Taylor and Nolan meet in the abandoned cabin, on the other hand, they seem pretty adamant about proving that the campus is using their technology for just that. Perhaps Claire catches wind of what her son is doing and decides to put a stop to it once and for all.
- She seems a little too calm when "the perfect posse" claim that Jeremy is the one who murdered Nolan. Perhaps because this clears her name?
- Shortly after Taylor shoots Jeremy, Claire has her sent away to a "retreat" against her will. If she's willing to send her own daughter away, what is she willing to do to her son?
Why She's Not the Killer:
- We'd like to give Claire the benefit of the doubt that she wouldn't actually murder her own flesh and blood.