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/
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Orochimaru has been planing to kill sasori but he didn't know from the start that sasori was dead.
It's after the ending credits in episode 25 of naruto shippuden.
First of all, there are 11. The team has only nine at a time, but one member (Orochimaru) was defected from the group and one (Sasori) was killed and replaced by Tobi. Here is the complete list of members (past and present):Itachi Uchuha and Kisame Hoshigaki.Akasuna no Sasori, Orochimaru, Deidara, and Tobi.Pain and Konan.Hidan and Kakuzu.Zetsu
naruto because if you watch the beginning of shippuden you will see that naruto almost killes orochimaru
SPOILER ALERT Depends on what you are asking. His partner in the Akatsuki is Kisame Hoshigaki. I assume that is what you mean.
Sasori hidan tobi nagato kisame kohnan zetsu itachi deidara kakuzu orochimaru (former)