In which way does Simon's death represent the death of innocence in the island?
Simon represents the mystic and the thinker on the island. He does not take sides among the boys and he tries to think things out, preferring to go off by himself to do his thinking. He does not succumb to the evil on the island like the others do. In this sense, he is also representative of innocence. Even Piggy and Ralph are present at and do not stop the killing of Simon which shows that they have fallen prey, to a small extent, to the savagery and evil on the island. Chapter 8 gives the clearest example of Simon as the innocent thinker and the mystic. This is the chapter in which he "talks" with the Lord of the Flies and then, by himself, discovers the truth of the dead parachutist. When he tries to clear up, with the others, the fact that the dead parachutist is just that and not a beast, he is killed in a frenzy by the boys. His death kills off the only innocent person on the island.
Simon's death represents the death of innocence because Simon himself was innocent. He is the Christ-figure on the island; he is kind to the outcasts, like the "littluns" and Piggy; he does not kill; he is helpful; he has a strong connection to nature. He is killed when he comes to tell the others that "the beast" is really a dead parachutist, and that they have nothing to fear. He alone does not give in to evil ways. He is the only innocent one.