Quote ReignOfTerror: If you read spoilers, they have already mentioned who Ricks killer is.
Do u think it will be Scotty? If it is it will really make sense. I think that he still loved Laura after all those years, and was trying to protect her. But it backfired when she lost her mind. ?)
The spoilers actually NAME who the killer is, so I know who it is or isn't.
I don't have the link to that spoiler, I read it on another board but it came from a link to a reliable source. The only thing I can tell you is, who the killer is. Or I should say, who they say the killer is. Spoilers can change all the time.