>> "there's only one person." she's like, "i know him." i said, "who?" and she's all, "his name's franc cano, he's a registered sex offender." >> reporter: in 2007, franc cano pleaded guilty to committing a lewd act on a minor. he was now on parole wearing a gps monitor. but now next question, did franc cano's monitor put him near the places those other three women, according to phone records, made their last calls? kianna, josephine, and martha? one by one, the detective entered the coordinates. >> and every intersection for the -- that date and time that they gave me, franc cano came up. >> wow. >> for every single intersection. >> it was -- it was -- i was shocked. >> reporter: but something about that man, franc cano. he had a buddy. and lomeli had run into them both. >> i mentioned, "you know, i do know that he has a friend --