suspicious, said the detective, was when clay, told he was free to go, didn't. >> then i couldn't get rid of him. he would not leave me alone. >> kept wanting to talk. >> he kept wanting to talk. what he kept telling me was the same thing over again. look on her phone, look on her computer, that will tell you everything you need to know. >> it's suspicious to you but it's not really evidence. >> no, not necessarily. it's suspicious, circumstantial, but suspicious to me. >> which meant that right there on day one clay needed to be checked out but good, and they began with his alibi for that december morning. his day started with car trouble and his text to chanin. asking her to take the kids to school. he said he spent much of december 1st walking between his home and the spot the car broke down, about a mile away. >> he told me that he had to go back and forth to his residence four times that day to work on his car and get tools, to eat, to take a nap. >> but detectives couldn't find anyone along that route who