Undetermined. The official death report reads "Not Ascertained". His UK roommates found him in his bedroom in his Scotland apartment. They hadn't seen him for awhile and thought he had went over to Europe for the annual Fortnight Holiday. A week later they called his cell phone and heard it ringing in his bedroom. This is when they discovered his body. It was too badly decomposed to do further testing and we will never truly know how my brother died. He was in good health and they ruled out foul play. He was currently employed but looking for a new job and his life seemed to be headed in a good direction. He was a free spirit who definitely lived his life to the fullest and I am proud of him for being brave enough to move to a different country all by himself and do so well for himself. RIP Bill, you will never be forgotten!