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Smeagul lives a simple life by the river, fishing.
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Deagle finds the ring fishing, Smeagle kills him for the ring, getting him banned from the river folk, forcing him to live in a cave.
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Bilbo finds Gollum's layer and steals the ring from him, chasing Bilbo he finds Shelob and works for her for a time
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Sauron's forces capture Gollum and torture him
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Gollum is found by the fellowship and is ignored until the Shire is separated, and he joins Frodo and Sam in the quest to destroy the ring. He eventually betrays them and tries to kill Frodo.
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Following Frodo and Sam to Mount Doom in a last effort to get his ring back, he bites Frodo's finger off, taking the ring. But gets shoved into the lava of Mount Doom, ending Gollum