karen hamm-samuels. josh mankiewicz (voiceover): and how did they know who she was? uency caller. so you've got a friend of diana's buying the disposable phone that called peggy just before she was killed. yeah. that was a big moment. josh mankiewicz (voiceover): now they knew who had bought the phone. the next step was to figure out who turned the track phone on. track phones need to be activated using another phone to call an 800 number. after three weeks, detective cole-hatchard finally persuaded a track phone manager to give him this piece of paper. stephen hatchard-cole: he had circled a phone number, and it was the number that called to activate that track phone. whose number was that? andrea benson. had that name surfaced before? yes, absolutely. all over diana's phone records. josh mankiewicz (voiceover): she was one of those people who had popped into diana's life when diana was in dc. and benson had a rap sheet. so what's going on here? how many people are involved in this? that's the question of the day. josh mankiewicz (voiceover): the other big question,