andrea benson s words were, she wouldn t die. at that point, according to andrea benson, diana nadell went into the kitchen, got a knife, came over and started stabbing peggy. reporter: andrea benson pleaded guilty to second degree murder. the sentence was 20 to life. i need you to know just how sorry i am. reporter: the woman who bought the tracfone, karen hamm-samuel, was never charged with anything. diana, apparently not content to wait in jail for trial, was caught on tape trying to arrange for hit men to kill karen hamm-samuel in miami. tell them i said it s absolutely imperative. the one in miami he s got to get rid of. the one in miami. right. reporter: after that, diana also pleaded guilty to first degree murder. diana did not respond to our requests for an interview.
it was her daughter-in-law diana. detectives knew that diana s friend, karen hamm-samuel, had bought the tracfone that called peggy s house just before she was murdered. diana had told police from the beginning that she d been in washington, d.c., to attend a wedding. but her alibi was wobbly. diana couldn t account for her time in d.c. she hit washington at about 9:30 and didn t reappear again until about 8:00 the next morning. reporter: so detectives called diana, asking her to fill in the gaps. i just have to confirm that you were up in washington. is there somebody i can talk to? what do you mean? we had to keep it real simple with her. listen. we just want to get you cleared. where did you spend the night? reporter: what did they not tell diana? detectives had a warrant and they were tapping her phone. police now sat back and listened as diana made multiple calls to
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