In Chapter Ten of Lord of the Flies, Ralph brings up "the highly charged issues of Simon's death at their hands." As Ralph is brooding over the event of killing Simon, Ralph points out that they have murdered Simon. Piggy denies it. He claims that he was outside the circle. Then Ralph thinks about it. He too remembers being outside the circle when the other boys were murdering Simon. 

Piggy objects to the term murder and does not want Samneric "to know that he and Ralph were at least somewhat involved in the deadly dance. Samneric don't want to admit their own involvement, either."

Piggy tries to keep life scientific and intellectual. He claims that Simon is responsible for his own murder. "He asserts that the assault on Simon was justifiable because Simon asked for it by inexplicably crawling out of the forest into the ring." 

No doubt, the next morning after Simon's death, Ralph and Piggy feel deeply ashamed. Ralph clutches the conch. He shouts that it was murder. Piggy shrieks that it was an accident. The two of them try to convince one another that they had no part in the murder. Of course, they were outside the circle. Golding does not state whether they intentionally remained outside the circle or if of was just too difficult to get closer to Simon who was in the ring. 

Truly, Ralph and Piggy are distressed. While Ralph seems to admit that it was murder, Piggy is in denial. Ralph is afraid:

“I’m frightened. Of us. I want to go home. Oh God, I want to go home.”