- Urbanus Venator
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Honor est praemium virtutis.
According to the Halo wiki:
It turned out that the structure was one of the Halo's Flood Containment Facilities. Keyes and his Marines were ambushed by the Flood. During the ensuing firefight, an Infection Form latched onto his back and infected him.
Keyes observed helplessly as the form took over his body and attacked his mind. Originally, Keyes' body was a Combat Form, but the Flood, apparently realizing his importance, merged him and several other Combat Forms into a Proto-Gravemind.
And by the way, this whining about Immortal is just as annoying as his threads.