The one who killed Sasori was Chiyo (using the puppets he made when he was a child. Those puppets looked like his parents).
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It was the combination of Sakura and Chiyo (his grandmother)
Sasori is from the Sand Village.
Orochimaru wasn't killed, just sealed. This is the start of Orochimaru and Sasuke's fight, continue reading till he is sealed. Copy and paste the link below to read the manga in english http://www.onemanga.com/Naruto/343/14/
Scorpion (Sasori)