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nightmare. she screamed and she yelled an she cried, it was terrible did she fell down the steps? no one was thinking someone di this to her, but did someone d this to her. it just unraveled from tha moment on. >> the fashionista with re lipstick she meant the world to me. when she walked into the roo it was like a movie star walke in >> corporate executive, caring mom, 1 million dollar smile an a 4 million dollar estate. >> oh my god, i need a ambulance. >> murdered. >> i went screaming out of the house. >> this was a prominent woman, murdered in her home, late a night. >> almost ce...

Door,. >> and when in there you go >> police had warrants for all the family members phones. a few weeks later, they ha boxes of records to come through. detectives analyzed suzanne' first. >> what could you tell about suzanne from her cell phon records. >> a lot >> investigator robin area from the westchester count d.a.'s office specializes in phone data analysis. >> i figure out a pattern of suzanne's life just based on her records. >> and on the day of peggy's murder,. that day was like >> that they would like every other day and suzanne's life there wasn't a change for that particular day ...

>> i'm glad everything's okay. we'll disregard for you. have a good night. >> reporter: it was probably the last time peggy's voice was heard by anyone except her killer. police were convinced -- still are convinced -- peggy was letting in someone that she knew. susanne? maybe. but why would she use a tracfone to get her mom to open the door in the middle of the night? >> she wouldn't have to let me in. i have a key. and i know the -- how to work the alarm. >> reporter: right. so if you wanted to kill her, you could have waited until she went to sleep -- >> and went in. >> reporter: unlocked t...