haven't been home. >> reporter: more friendly questions. >> where did you go to school? >> west texas a&m university. >> reporter: cedillo asked about thanksgiving. small talk. >> what'd you make? >> i made turkey, and there was stuffing and mashed potatoes and green bean casserole and this cabbage bacon salad that my mom really likes but i don't think david liked it very much. >> reporter: except this wasn't really small talk. detective cedillo was paying close attention. >> alright. so let's start with this morning. >> okay. >> all right. >> this morning. >> okay, what time did you get up? >> about 7:30. 7:45. >> okay and then what happened then? >> and then we talked and i went back to sleep. when i woke up he wasn't there. >> okay. >> reporter: he'd heard enough. >> i know that's a lie. >> no, it's -- no, it's not. >> do you know why i know it's a lie? >> why do you know it's a lie? >> because i saw you come out of your apartment and get in the passenger seat of that car and i saw him drive out of there. that's why i know it's a lie.