about a disturbing incident involving gutierrez and his wife. >> i guess he got upset with her over something, flew off the handle. he was described as having a really bad temper. pushed her down on the floor, grabbed a pillow, put it over her face and tried to smother her with it. >> davis then re-interviewed gutierrez. he gave the same story, denying everything. only his body language was a little more forthcoming. >> he acted about as squirrelly as you could possibly get. and by that, i mean, he was nervous. he didn't want to be there. he couldn't wait to get the interview over with. and after talking to mr. gutierrez, he stood out like a sore thumb. >> davis got a warrant to draw a blood sample. dna testing was possible by then but still not quite precise. and once again the saliva on two of the cigarette butts in christie's trash can could have been gutierrez's -- could have been. at that time it wasn't even as good as a fingerprint. >> no, it wasn't. >> did you arrest him?