I think Billy Joe Cobra had cardiac arrest caused by acute hemorrhagic pancreatitis while asleep (bangungot). He was 27. According to my theories, the group attended Billy's Birthday party the night before (Last December 22, 2012 (in advanced because of they are celebrating Christmas Eve) and went back to their cottage at around 2 AM Sunday. The five friends slept together in one big room, but Hugh (Spencer's Dad) occupied the loft because he was a snorer. At around 6 AM, Billy was heard groaning but his companions dismissed it as mere snoring. When Hugh (Spencer's Dad) tried to wake Billy at past 9AM, he found Billy stiff and lifeless.