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The subject matter of this article contains in-development information that was cut from the final version of an official and/or canonical source and appears in no other canonical source. It may also contain incomplete information since not all cut material is publicly known.
The Zombie Assassin is a Zombie cut from Half-Life 2, and the only Zombie variant known to have been cut from the series.
The Zombie Assassin was to be the Zombie form of the Alien Assassin, a Combine unit cut from Half-Life 2. When the Combine units were simplified, the Assassin's AI was recycled into the Fast Zombie, making the Zombie Assassin redundant.
Its model can be found in the Half-Life 2 leak files, but it has no animations and no AI for the NPC are found in the files. Texture-wise, the blending between the limbs and chest/waist texture files is also not well finished, and it has missing bump maps on the arms, showing the standard checkerboard used for missing materials (fixed in our version). Its related sounds are also not present. For instance, when shot at in-game, the impacts sounds are that of metal.
As seen in the model, the Zombie Assassin appears as even more transformed than the Classic Zombie, the Headcrab's rear left leg going inside the Assassin's back even further than in Classic Zombies, to reappear near the Assassin's right shoulder. The hands and feet have also turned a bright red, and the bones of the forearms have become visible.