jamie was taking time off from her studies at texas a&m and was working at a pizza parlor. her shift ended at midnight. >> we contacted everyone she delivered pizzas to and nothing out of the ordinary. >> afterward she headed to a friend's house. >> she watched movies and left the house at 11:30. >> what time do you think she was killed? >> we got the call at 7:15 a.m. so between 4:30 a.m. and 7:00 a.m. >> the friend was supposed to be the last one that saw her alive. the detective paid him a visit. >> he was upset, obviously. they were friends and had been for some time. >> the friend's grief seemed genuine, but something wasn't peculiar. when investigators asked for a dna sample -- >> he said no. >> no? >> of course, we wanted to know why. was he the killer or was he not? >> the detective was determined to answer that question.