Pretty sure Aaron survived in the KGB Files, but was basically made into a ghoul in the epilogue. Make of that what you will.
I ended up turning into a proto-Shoggoth at the end of the original Divine Fire, though I can't remember how I went out in KGB. The only thing I recall is driving the truck into the ditch in an attempt to kill the ghoul.
I think that it's also worth noting that in Shadows of Leuven, just before attacking the sorcerer, Aaron uttered the prophetic words: "It's nearly three o'clock in the morning, somebody has to die".
I'm still proud of this one if only that I threw a wrench into the sorcerers plans to extend his life. Granted that wrench
was my life, but I think it was well worth it. Plus I didn't want to fall asleep running my game the next day.