L.A. Noire Stuck on the end of mission 13.?

At the end of mission 13 in L.A. Noire, I cannot kill the Dahla killer. In the catacombs of the chuch, I cant see a thing, and cannot find him. I run into walls and it is so dark that I can hardly see. Please help me, and DO NOT leave a answer saying "just run around and find him" or things like that. Thanks alot, I apreciate your advice.