scientist and what we know about the development of rigor mortise. >> would a jury belief? science, or the words from two of corey's own sons? cory's brother, a dentist, found himself struggling over the conflicting facts. >> science is my living, you know. it's, i have to believe in, that but i also have to believe in the family at the same time. so i'm completely. torn >> i've never seen a more difficult case, more closely. >> there seems to be no middle. ground there is none. >> parkinson urged the jury to focus on the science in one image. cory in her bed, her body in rio mortise. he said it proves she died hours before it is claimed. it proved he was lying. it proved he argued that curtis killed her. coming up, the defense gets in turn and christine is feeling optimistic. >> i knew in my heart he was coming. home >> until. christine came in and they explain to her what was about