I just beat the game. Luckily, after glancing at this thread, I never saw that Scott Shelby was the killer. My God, this game was awesome!!
-I drove on the wrong side of the highway.
-I survived the power plant
-I cut of my finger
-I didn't kill (I would never kill anyone in cold blood).
-I drank the poison
Also, Jayden died facing off against the Origami Killer. But the killer didn't get away! I'm going to replay the game, tomorrow. Still, I think that what happened in this ending was the most satisfying. This game was amazing.