spitz must examine mr.'s head, starting from the outside, and working his way in. >> a lot of bleeding on his scalp. >> michelle removes excess blood from the skull bone to uncover any hidden wounds. and the extent of charles krueger's head trauma quickly becomes apparent. >> oh, look at this. he's got a fracture. yep. just take your side and i'll take a scalpel to it. we have a fracture here i want to just scrape off. see if we can see how far it goes. it goes all over the place, comes here and branches that way, that way. >> the extensive skull fractures prove one thing. krueger hit his head hard. >> the question we still have is what internal injuries is he going to have as a result of that. what injuries are going to involve the brain, the bleeding over the brain like a subdural hemorrhage and then the real question is, do these injuries fit with his own actions, his own fall down the stairway or could it implicate somebody else? let us see what's in his head. >> now christina moves on to face two of he