I enjoy playing. I didn't understand the final. Is he a really going to murder that guy and how this case is related to his wife's death?
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MAJOR SPOILER ALERT: (watch a playthrough or replay the game if you want to find out yourself)
He is the serial killer who takes revenge from the alcoholics because his wife was killed by one. He was up on the mountain trying to cover up his murders by saying that he killed the serial killer and have Ella as his witness.