Hmm... how should I answer this question? Simply put, Orochimaru was not killed by Itachi, but by Sasuke. Sasuke killed Orochimaru in Orochimaru's weakest condition, knowing that Orochimaru had no more power to grant him.
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To get him out of sasuke, which in turn gets rid of sasuke's curse mark Itachi does not kill Orochimaru, Sasuke does so he can get even stronger and kill Itachi
he didn't Sasuke killed Orochimaru himself ,well sort of.
SPOILER WARNING!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!----------------------------------------------------------------------------------------------------------Itachi Uchiha killed Orochimaru. Some say that Sasuke Uchiha killed him, but technically, he didn't. Sasuke only consumed/took over Orochimaru. Then, in the battle between Sasuke and Itachi, Orochimaru came out of Sasuke, then Itachi killed him. Then, Sasuke Uchiha killed Itachi Uchiha
no he didnt. sasuke killed orachimaru by himself whilst orachimaru was weak and frail. wrong while orochimaru wuz trying to get sasuke body in the ritual that's when he killed him orochimaru wuz regular then you are both wrong it was highlighted orochimaru was in a weakened state and had to leave his body. also itachi did help sasuke as the dark mark was stil part of orochimaru as you saw in sasuke vs itachi and he drew orochimaru out of sasuke.
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/
In Naruto shippuuden kabuto keeps helping orochimaru take and regenerate his body to be immortal, soon after orochimaru was killed by sasuke kabuto was a rouge ninja meeting up with naruto and handing him a Bingo book [Akatsuki & Missing ninja list] He went off after Obsorbing orochimaru, its said that naruto went 8 tails and killed kabuto, mor Ethan that i do not know.