SIMON.
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Yes he was. He had just found out that the beast lives within and was going to tell all the boys. But the boys were having a feast and partying. When he comes out of the jungle, the boys think he is the beast and stab him to death, everyone takes part. The next day everyone realizes it is Simon; yet no one will admit it was. :)
The head of the pig which they had hunted and killed.
Jack convinces the boys (and arguably himself) that it was the beast they killed, which was their first reaction upon seeing Simon due to mob mentality. Even though Ralph and Piggy admit to each other they knew it was Simon, Jack perpetuates the myth of the beast on his side of the island. This is arguably because in keeping fear of the unknown alive on the island, Jack is better able to lead in a totalitarian-like way. He convinces the boys that even though that night they thought they had killed the beast, that they actually hadn't - that they actually couldn't - and he suggests leaving sacrifices for it instead.
Because of Dylan Campbell
The imaginary beast that frightens all the boys stands for the primal instinct of savagery that exists within all human beings. The boys are afraid of the beast, but only Simon reaches the realization that they fear the beast because it exists within each of them. As the boys grow more savage, their belief in the beast grows stronger. By the end of the novel, the boys are leaving it sacrifices and treating it as a totemic god. The boys' behavior is what brings the beast into existence, so the more savagely the boys act, the more real the beast seems to become.