Why Did Darth Vader Die in Return of the Jedi? - Star Wars Explained

In Star Wars Return of the Jedi, why did Darth Vader die? Was it at the hands of Luke Skywalker? Emperor Palpatine? Or did he lose the will to live like Padme?\r
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What if Anakin WAS Granted the Rank of Master - \r
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Anakins Thoughts While Being Burned on Mustafar and Turning Into Darth Vader - \r
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8 Jedi Master Who Became Sith Lords - \r
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How Did Anakin Kill All Jedi at the Temple During Order 66? Revenge of the Sith -Star Wars Explained \r
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What if Order 66 Failed? Star Wars Theory \r
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The Story and Reason Behind Darth Mauls Double Bladed Lightsaber \r
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Count Dookus Reion to Qui Gon Jinns Death\r
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What If Qui Gon Jinn Trained Anakin Skywalker? \r
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What if Darth Maul Trained Anakin Skywalker? \r
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What if Padme Survived? \r
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What if Mace Windu Killed Darth Sidious? \r