The pole's coming out of Nagato's back were part of some summoning technique which he used to kill the leader of the rain village, i think.
It was shown in one of the flashback episodes quite recently, during Naruto and Nagato's talk in the tree.
Chat with our AI personalities
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. it is in naruto shipudden episode 159!!!
Shizune is alive because after Naruto convinced Nagato to stop attacking or whatever, Nagato used one of the last powers of the Sage of Six Paths to bring everyone back!
If you by returning mean "coming back from death:", then the first time we see Nagato again is manga chapter 490, in which Kabuto shows Madara he can use "Impure world ressurection" to bring all the dead Akatsuki members back to life. This chapter has not been animated yet.
no one kills nagato he dies cz he uses 2 much chakra or something when he uses his ninjutsu that brings the dead back to life. ps: there is no human, animal or a plant that can bring anything or anyone to life! this is a stupid ending.
Yes Kakashi does come back to life. Nagato does some jutsu and brings back all the people that died in the attack on Konoho. Including Kakashi.