He goes on to reveal that he is, in fact, Scott's twin brother, William, and that he murdered Scott before they left for the party. William tells Marcus he blames him for the deaths of his parents all those years ago as he was the one that wanted to play Seventy Five. William then turns on his accomplice, stabbing him, before a fight breaks out between him, Karina and Marcus.
It is later revealed that he is actually Scott's twin brother, William, and that he committed the murder of Scott prior to their departure for the party. William accuses Marcus of being responsible for the deaths of his parents years ago because Marcus was the one who wanted to play Seventy Five. This leads to a violent confrontation between William, Karina, and Marcus.