"I was Baptized thrice. Once in water, once in flame, and one more time in vodka. I will carry the Holy Slavic Spirit with me until i stand before the lord in judgement."
I'm pretty sure you can find it somewhere in the game files and youtube videos, but they just used a generic normal face for him with no damage whatsoever.
It would have been funny if the Courier could cannibalize Joshua Graham, only for him to reappear later in the game to enact his revenge. I would call the mod "Revenge of The Jerky"