reporter: and on the day of peggy s murder that day was like every other day in susanne s life. there was no change for that particular day. reporter: and you d expect to see a change if somebody was in the process of committing murder for the first time? correct. correct. reporter: suggesting she s innocent? either she s innocent or she has another phone. but there certainly wasn t communication that indicated that something was going to happen. reporter: as hot as detectives were on susanne s trail, they had never stopped looking at the other members of peggy s immediate family. you talked to peggy s son jim and his wife diana right after the murder? yes, when they came up. reporter: they live in florida? correct. reporter: were they in florida at the time of the murder? jim was in florida. and diana said she was in d.c. reporter: why was she in d.c.? she said there was a family wedding. reporter: and the records backed that up. when robyn arias looked
my sister-in-law used to call every morning. my mother would be on my phone with me and say, oh, i gotta go. diana s calling on the other line. reporter: diana was a stay-at-home mom with two kids, leah and harris. peggy doted on her grandchildren and would fly them up to new york to spend summers and holidays. detectives had already confirmed that diana s cell phone had been in washington, d.c., at the time of the murder. but when phone analyst robyn arias looked more closely at diana s calling pattern something seemed off. when she was in d.c. her activity was just all over the place. kind of the frenetic feel. there was definitely something going on. reporter: now arias looked at who diana was calling, putting names and faces to the numbers on her phone. she noticed diana suddenly seemed have a lot of new friends in washington, d.c. a lot of people just popped
this is not the way i wanted to get my money. that s the exact words she used. reporter: this woman wants to talk her way right away. at one point, you said this is not how i wanted to get my money. i don t recall saying that. but if they have that on, you know, on record, you know? reporter: but you believe me that that s what you told police? yeah. reporter: because again you re answering a question the police haven t even asked yet. i guess i watch too many of those dateline shows in the middle of the night. reporter: detectives had already talked to susanne and her husband bobby on the day of the murder. questioned them for hours. you had nothing to worry about. no, not at all. not at all. farthest thing from my mind is that i would be a suspect or my wife would be a suspect. reporter: police were feeling differently, and as their scrutiny intensified, bobby and susanne decided to hire an attorney and stop talking to the
florida. diana s phone records checked out, too. where was diana s phone during that time? in d.c. reporter: that s it? didn t move. did not move. the phone went to d.c., went back to florida. reporter: reasonable to assume that diana never left d.c.? absolutely. reporter: but you re smiling. there was just a break. the pattern just was off. reporter: diana s records were speaking to arias, and detectives were about to get a break that would shift the direction of the entire investigation. let s just say, this case was about to go south. that secret burner phone, who bought it? who used it? get ready for a whole new circle of suspects. so what s going on here? how many people are involved in this? that s the question of the day.
detectives would be going into extra innings. coming up the two final phone calls of peggy nadell s life. one came from a secret phone. these are the phones used by drug dealers, killers, cheating spouses. that s correct. could that caller be the killer? aintenance, right? and if they don t like it, they give em their money back. wait, they take the car back? that s crazy! what if it was driven by like a zookeeper? or a mud wrestler? or a guy who s on the outs with the missus and he just needs a place to sleep for seven days? yeah. (vo) buy your car online. love it or return it. with carvana.