Okay. Now that there's more information... Hatake Kakashi does die fighting pain. But after Naruto defeats all of the bodies of Nagato (who is the actual person controlling the six other bodies) and Naruto goes to talk to Nagato. After they talk and Naruto hears Konan, Nagato, and Yahiko's story, he gives Nagato his answer to finding peace. Nagato is changed and uses his last bit of energy to bring back to life everyone that was killed in the attack on Konoha. That includes Kakashi! So Kakashi is brought back to life.
so technically he does die temporarily but then he comes back to life.