A former crewman of Captain Flint abandoned on the island, who has gone mad from isolation. He guards the treasure in a cave, guides the survivors to it, kills and devours Livesey during a psychotic episode, and is killed by Silver.
Silver ends Ben Gunn's life after the latter's violent breakdown.
After finding the partially devoured body of Livesey, John Silver kills Ben Gunn in anger.
Ben Gunn provides the route to the hidden treasure.
Ben Gunn guides the survivors, including Jim Hawkins, to the cave containing the treasure.
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