>> yeah. >> what were you thinking? >> i didn't know what to think. i try to run up there to go to the house and they were like, no you can't going. i'm like well, i just want to know, i just want to know what happened to my daughter. is she in there? where is she? >> they eventually took me downtown and then one of the policeman came in and told me that she had been shot. the worst day of my life. >> now she had to tell her husband, denise father's. >> fell apart, cried. i guess it's every parent's worst nightmare. they have a child taken from them. >> as denise's family reeled from their unimaginable loss, this quiet central illinois community was just starting to grapple with the fall of a murder on valentine's day. >> did you feel like we have a mystery on our hands? we've got to solve this? >> yeah, we knew we had something bad. and we knew that it was going to take a lot of work to get to the point where we knew who done it. >> coming up -- a possible clue. >> and then pulled into our driveway. >> without the headlights on? >> without headlights? >> without the headlights. >> nathan remember seeing a suspicious car near his house not long before the murder. >> this is kind of weird.