Pein killed him but he comes back ;)

yes, like ziva said pein did it

O.O he died? i guess i missed that episode. GOSH, RumbleKing U NEARLY GAVE A HEART ATTACK DX

well kakashi didn't exactly get killed but watch this video and you'll find out how he 'died'.
(This is only the part when he dies so if you wanna watch the whole battle go to

link

after watching that i got another vid which will show that kakashi doesn't die which i think is very good, visit

link)

WARNING SPOILER;

YESSSSSSSSSSSSSSSSSS!!!!!!!!!!!!!!!! KKSHI DUZNT DIE!!!!!!!!!!!!

Pain does not killed Kakashi, but ALMOST killed Kakashi. Because Kakashi come back life after meet his father and after naruto kill them (PAIN).