moriarty was encouraged by comparison scans of erica's brain.and the bone fragments in the pre-op image were gone. but despite the repair, brain injuries are unpredictable. and dr. moriarty urged caution. the next three days in the icu are going to be critical. rich arnold: painting it now, another shell casing. hoda kotb: at the crime scene, detective arnold continued to sift through clues. more leads came into focus. a bloody footprint, three big red soda cans and two cigarette butts by the bed. the second one had an ash about an inch long. some had left that cigarette and rushed out of there. hoda kotb: detective arnold ordered dna testing on the cigarettes and cans. the detective was also learning about earon and the more he found out, the more he was drawn in. mostly by herself, earon was raising four children, including erica, the only one home the night of the shooting, and ebony, the oldest at 16. instead of like mother and daughter, we were more like sisters. you were like friends, huh? yeah, we did everything together. she was the best