HK-51
From Wookieepedia, the Star Wars wiki.
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HK-51 assassin droids were advanced versions of HK-50 assassin droids that were manufactured by G0-T0 in the HK Manufacturing Plant. Their appearance was like that of HK-47 and the HK-50's save for their photoreceptors glowing icy blue instead of heated orange and their durasteel was black in color.
[edit] Behind the scenes
In a removed part of Star Wars: Knights of the Old Republic II: The Sith Lords, HK-47 would confront G0-T0 on Malachor V, and a group of HK-51 droids would come and help him defeat G0-T0. The HK Manufacturing Plant was also a removed part of the game.
