. >> reporter: rockdale county district attorney richard read. >> we needed to look at joe carter, especiallyince nikki and joe had been in an argument. they were breaking up. >> reporter: that's a dangerous time. >> it can be a dangerous time in a relationship. >> reporter: wasn't hard to track down joe, he was at the barber shop where he worked. >> it was around closing time. we was ready to pack up and get out of there. and they approached me and my friends, then they basically said that she passed away. i mean she's dead. i was shocked. i was just in shock. >> reporter: how'd he react when you came to see him? >> he immediately started weeping. >> reporter: he didn't know about the -- >> no. >> reporter: or claimed not to know? >> he claimed not to know. >> reporter: but reactions don't always tell the real story. >> they was basically asking about our relationship, when the last time i seen her, and i started to realize i was a suspect. >> reporter: detective moon did what any good detective would do, he looked for the sort of marks nikki might have left on her assailant's body. >> we lo