After the death of Piggy Jack screamed at Ralph that there wasn't a tribe for him any more and that the conch was gone, then he hurled his spear at Ralph with the full intention of killing him. Ralph could see the rest of Jack's tribe gathering, ready to charge him so he ran, avoiding the spears which they threw at him. Afterwards Ralph punched the pig's skull from the stick on which it was mounted, in the jungle clearing, and took the stick to use as a weapon. He returned in the evening to castle rock and spoke to Samneric who were on guard. They gave him some meat and told him that Jack planned to hunt him the next day. The following moring, having found Ralph's plans by torturing the twins, Jack had a boulder rolled into the thicket where Ralph was hiding. When this failed to drive Ralph out or kill him Jack lit a fire hoping to smoke Ralph out. The fire quickly got out of control. Ralph made a run for it through the smoke filled jungle and eventually ended up on the beach, near the shelters, where a naval officer was standing. A passing naval vessel had seen the smoke caused by Jack setting the entire island alight, and had come to investigate.
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When Piggy and Ralph were at Castle Rock Roger pushed the boulder over the cliff and Piggy was killed when it hit part of his body and knocked him off the mountain forty feet on to a rock. That all happened in Chapter 11, Castle Rock.
Another answer: Piggy dies on the day that he and Ralph went to Castle Rock to demand the return of Piggy's glasses. This is the day before Ralph is hunted, the island is set on fire and the boys are eventually rescued. The boulder did not hit him on the head. The boulder actually struck Piggy a glancing blow, from chin to knee, which smashed the conch into a "thousand white fragments." Piggy traveled sideways through the air, turning over as he went. Piggy fell forty feet and landed, on his back, on the square rock in the sea. "His head opened and stuff came out and turned red. Piggy's arms and legs twitched a bit, like a pig's after it has been killed."
Piggy was holding the conch and trying to talk to Jack and the other boys on how to survive. Roger, who is truly evil, slide a boulder over the edge of a cliff. The rock fell on top of Piggy, killing him, and smashing the conch into pieces. :)
Simon dies at the end of chapter 9: A view to a Death. Simon had climbed to the top of the mountain and discovered that the so called beast was simply the body of a dead parachutist. He made his way through the darkening jungle to inform the other boys, who were attending a feast thrown by Jack on the beach, of his discovery. A storm was brewing and after eating the boys began to do their 'pig dance.' In the flickering light of the fire and the flashes of lightening the over excited boys saw Simon stumble from the forest and mistook him for the beast. They attacked Simon and beat, punched, bit and clawed him to death.
He falls from the cliff when the boulder, sent crashing down from Castle Rock by Roger, gives him a glancing blow.
Piggy is the symbol of adulthood, civilization and reason. the boys are beyond all reason, so piggy has to die
Piggy was killed by a boulder. Roger dropped a boulder onto Piggy, and Piggy was stricken by the boulder and fell 40 feet landing on his back.
In piggys asswhole
Simon retrieved Piggy's glasses for him, after they had fallen onto the rocks as a result of Jack punching Piggy.
death
Bloody hell they were
His Father has died, and what happened to his mother is unknown HOWEVER: based on Piggy's voice trailing off, it is ok to infer that his mother has abandoned him