woman was lying, and that diana was trying to cover her tracks. but they still didn't have enough to charge diana. so they headed to miami, to speak with diana's friend who bought that tracfone, karen hamm-samuel. they brought karen into miami police headquarters for questioning. >> all set? >> reporter: karen admitted she bought that tracfone for diana. then they asked her if diana had said anything about peggy nadell's murder. her answer blew them away. >> she did say that she was there at the mother-in-law's. >> did she tell you who stabbed her? >> no. >> reporter: prosecutor richard moran was there listening in another room. >> and that's the first time we have first-hand information that diana was in the house. >> reporter: before long, diana was in that same miami interrogation room where she recognized some familiar faces she probably wasn't pleased to