michael wilkie savagely killed his wife while baby sydney was in the room. ies on her phone. >> i especially love it when defendants get ahold of their victim's cell phone and text in their place. >> reporter: that night he drags his dead wife through the house, out to the back yard where he incinerates her body in that suspicious bonfire. >> clearly to burn a body where there's little to nothing left, it would have to be a fire of some impressive size. >> reporter: to cover up the crime, he scrubs the house spotless and later drives a barrel of charred remains to the back of his parents' property. but he still has to explain shelby's disappearance, so he concocts the runaway theory by driving shelby's car to the airport early monday morning. that's him in the security camera footage. >> you see a figure right here approaching the taxi cab stand. >> reporter: to mask his role in shelby's vanishing, wilkie then leaves those concerned voice mails at her office on monday. >> people are trying to get ahold of you and you're not returning any calls and stuff. just