nothing about this newman man who is deceased. >> however the e-mails exchanged between ari and denise squire the fire leave little doubt in the minds of investigators. >> he needed denise involved because they were not going to give the $5 million to him. who were they going to give it to? denise. in order for him to get anything, she would have to be involved. >> ari squire spent months planning the murder, but science had the upper hand in finding the truth. >> the power thcoward that tooky way out after he took the life of a 20-year-old kid. >> forensic dentistry worked. i never have seen a case that took so many turns and so many different directions and it was the natural signs. you can't by definition, it's science and it works and it's repeatable. it's verifiable. it's accepted. >> up next, a suspicious house fire nearly kills an entire family. >> had she been in there longer, she wouldn't have survived. >> the husband is assaulted and the wife is dead. >> who did this? everyone was in lockdown mode. new lights and sensors had been performed and everyone was on edge. >> police had no