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Technically speaking, Harry doesn't kill voldemort because it was actually voldemort's own killing curse (avada kedavra) that backfired on him. Everyone considers Harry as voldemort's killer but he actually wasn't. Harry simply knew how the elder wand (the powerful wand that voldemort stole from dumbledore's grave) works so he knew that simply by disarming voldemort, he won't be killed.

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