Early in the novel Roger hid behind a tree and threw stones at Henry. At that time the prohibitions and laws of his former life still held sway over his subconcious and he threw the stones wide of his target, although he wanted to hit henry. Over the course of the novel Roger's inate sadism is hinted at and under Jack's rule Roger has increasingly been able to shake himself free of the last shackles of restraint. When he sees Piggy down below him, and knowing full well that Jack dislikes Piggy, Roger gives into the over powering urge to hurt and kill and just lets the rock go, by this time totally freed from any thoughts of remorse or restraint.
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The boulder which hit Piggy with a glancing blow and knocked him off the cliff was set in motion by Roger. Roger pushed the lever, which was wedged under the rock, and caused it to tumble from the top of castle rock.
Roger pulled a lever and dropped a huge rock on him, causing him to fall off the cliff and his head crack open, as well as this the conch is smashed into tiny pieces.
Yes piggy was killed by one of the hunters named Roger who pushed a bolder off the cliff to where Piggy was standing which pushed piggy off of the cliff on to sharp rocks which killed him
Piggy died when the boys rolled the rock. He fell off the cliff and the rock smashed him into pieces. Poor piggy. Pork, anyone?
~SPOILER ALERT~ Jack doesn't do much to Piggy other than steal his glasses in order to make a flame. Early in the book, Jack hits Piggy and breaks one lens. Later on in the story, Roger, I believe his name is, kills Piggy by pushing a big rock off the cliff and it cracks Piggy's head and he drifts off to sea.