. >> we're continuing our investigation into the death of ellen greenburg, who was found stabbed to deathwith 20 knife wounds. philadelphia authorities closed the case, declaring her brutal and a suicide. but world renowned experts hired by ellen's family to look at the state's evidence say that makes no sense. >> there was an independent forensic pathologist who also happens to be a neuropathologist, who looked at the spinal cord at the philadelphia medical examiner's office. she pointed it out during deposition. >> the issue is, i don't think that this injury would have caused any symptoms because there's no response to it. there's no reaction. >> to it. what does that mean? >> there's no hemorrhage. >> what you're saying is ellen would have been dead when this was administered. >> yeah. >> let me repeat that. the wound that ellen supposedly inflicted upon herself could only have been sustained. could it have been thrust into the back of her neck after she was dead? >> conclusion. >> this is a homicide. not guessing. not surmising, not an opinion. if that spinal column per the neuropath