how does simon die?

While celebrating and feasting on the hunted pig, the boys begin dancing and chanting wildly at Jack's urging, and they are soon consumed by frenzy. The storm begins, and a figure emerges suddenly from the forest. It is Simon, running to tell the others about the dead parachutist. Caught up in the madness of the dance, however, they do not recognize him. As Simon cries out about the dead body on the mountain, the boys rush after him with violent malice. They fall on Simon, striking him repeatedly until he is dead.