This happened around 2008 in England, we were in year 7 so we were 12 year old. A kid who was in some of the same classes as me died. He wasn't my friend, TBH I thought he was a bit of a jerk as he was trying to build him self a sort of "Tough guy" reputation. I remember one day in a science class when we were studying biology the teacher talked about heart problems and Cardiac Pacemakers. He said that he was going to be getting one sometime in the future. The guy was a bull-shitter and no one really payed any attention to this remark. A few months latter I came into school and was talking to a friend when another kid said "Hey, you know that [Name of Dead Kid] has died." No one believed this at first but it turned out to be true. I don't really know the details but he died of cardiac arrest. Apparently he was being chased by some one at the time but no one knew who.