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 certainly someone sh knew correct where would it lead a twisted case of betrayal and greed. the fingers being pointed a me her own daughter of suspect from the start you pulled the knife out an you tell the police oh you are going to find my fingerprint on the knife her son in law who seemed s devoted. they interrogated us fo eight hours. or maybe someone else with million dollar motive.
arrival at reagan national airport, 9:30 friday morning the day before peggy was murdered we got the video from the airport to follow her throug the airport and then follow he outside to where she got into car. here s video diana bein picked up curbside who picks her up? andrea benson how do you know it s andrea benson it s her car registered t her. are you going to licens plate those cameras. detectives obtained dat dumps from cell phone towers i washington d.c.. that allowed them to matc the travel of the cell phones. can you follow diana s cell phone? it bounced all around washington d.c. simultaneously with andrea s, they were together day-to-day. by late friday, the night peggy was murdered, dana s phone stopped moving and wen quiet. but andrea s phone
reporter: detectives obtained data dumps from cell phone towers in washington, d.c., that allowed them to map the travel of the cell phones as they pinged off the towers. can you follow diana s cell phone? it bounced all around washington, d.c., simultaneously with andrea s. they were together the entire day. reporter: by late friday, the night peggy was murdered, diana s phone stopped moving and went quiet. but andrea s phone? we saw andrea s phone head out of the washington area and head up i-95. reporter: exactly the way you would drive if you were heading for peggy s house? right. reporter: along the way, the tracfone was activated. and at 1:17 a.m., it pinged a cell tower right near peggy s house. what was going on? was this murder for hire? did andrea benson drive up to new york, call peggy on the tracfone, somehow get into her house and murder her?