He hasn't died so far, although he was sealed for a while. He is currently on the battlefield fighting against the remaning Akatsuki.
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orochimaru dies in episode 138 of naruto shippuden
Naruto vs. Haku, Naruto vs. Orochimaru, Naruto vs. Kimimaru, Naruto vs. Sasuke, Naruto vs. Deidara/Sasori, Naruto vs. Orochimaru, Naruto vs. Pain.
Orochimaru fought the Third Hokage during episodes 68-80 of Naruto part 1
naruto shippuden epidode 113
he didn't Sasuke killed Orochimaru himself ,well sort of.