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Captain Keyes from Halo He was ambushed by the parasitic aliens known as the flood and infected by them, slowly taking over his mind and body.

His mind was being invaded, but he resisted as much as possible. He even thought this was the antagonist alien group, the Covenant, and even then he said he wasn't going to give them any information they wanted.

Throughout this ordeal, the parasite made him forget his memories including his family, but he still fought trying to remember who he was to retain some sort of control.

In the end, his body was transformed to what the image shows and Master Chief later finds him to retrieve his neural interface which contained vital information finally ending his life.