>> reporter: and now three months later, here was carter talking to the police who were growing suspicious that she and her boyfriend were connected to ashlea's murder. >> why am i here? >> reporter: cedillo started off easy. >> so were you raised in amarillo or just -- >> no. i'm originally from lubbock. >> is your family still here? >> yes. >> mom and dad, brothers and sisters? >> i don't have any brothers but i do have two sisters. and they all still live in lubbock. >> have you seen mom and dad in a while? >> no. i talk to them every day on text message and snapchat, but i 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.