Well due to Piggy's exhaustion caused by his weight, and the fellow boys testosterone overflowing their bodies. It was only inevitable that Piggy was overpowered and gang raped by the other boys on the island. Thus, resulting in Piggy going insane, or checking out mentally for the rest of the story.
Piggy
Samneric and Piggy.
He can't see!!
to kill the pig
in chapter four on page 64 the third to last paragraph
piggy's glasses.
Piggy
Haleeb.
the end of chapter 5
Samneric and Piggy.
to kill the pig
He can't see!!
In "Lord of the Flies," Piggy's glasses are taken in chapter 2, on page 40 in the 1999 Penguin Books edition. The boys take Piggy's glasses to start a fire.
in chapter four on page 64 the third to last paragraph
By Piggy's glasses and the sun reflecting off them
Piggy is the one who names the blossoms candle buds in "Lord of the Flies." He does so in Chapter 2 of the novel.
Piggy dies on the same day as Simon, in chapter 11 of "Lord of the Flies". The date is not explicitly mentioned in the text.