Scott Shelby

Scott Shelby is one of the four playable characters in video game, Heavy Rain. He was one of the four main protagonists only to reveal himself as the true main antagonist near the end of the game.

The Origami Killer revealed
Near the end, The Origami Killer as a child is revealed to be Shelby himself. His real name is Scott Sheppard.

The reason he became the killer is because he has a bad childhood with an abusive father. One rainy night, while playing with his brother John in a construction site, he is trapped in a well, and Scott tries to get help from their father, but he had no desire to do so. His brother dies as a result.

After John's death Scott was taken into care and adopted by the Shelby family.

When Madison Paige comes to apartment to find Shaun Mars' location, Shelby puts her into gunpoint and traps her in his closet in order to kill her in the explosion of his apartment. It depends if she escapes or not.

Death (Player choice)
Ethan Mars goes to a warehouse to save Shaun, but Shelby appears and reveals that he is one of the witnesses who saw him jumping in front a car in an unsuccessful attempt to save his first son Jason from being killed by it. This is the reason why he became the Origami Killer, just to find a father who will give up his life for his own son. When Ethan demands Shaun to be released, Shelby let him do it, but attempts to kill him so that his identity as the killer will be protected. Norman Jayden arrives and fights Shelby in a conveyor belt. The fight results in the killer's death.