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One he couldn't hear, teresa did not call from moundville. >> cell tower shows it's pinging from up in tuscaloosa. >> wait a minute. how could it be pinging from tuscaloosa? that's miles and miles away. >> right. there's no way she could have made the call and been back to the location where she was murdered at. >> courtesy of the cell towers, you were able to show that teresa could not have made that call. it had to be somebody else using her phone and what do you know? her phone is missing from the crime scene. >> correct. >> so the person who very likely killed teresa mayfield must have use...

Nothing. dawn told the investigators she phoned teresa over and over, and each time, the phone went to a recording. just to be sure of all this, they pulled teresa's cell phone records and began plotting out a timeline of her whereabouts, but the picture the records painted wasn't quite what they expected. that morning call to scott, the one he couldn't hear? teresa did not call from moundville. >> cell tower shows that it's pinging from up in tuscaloosa. >> wait a minute, how could it be pinging from tuscaloosa? that's miles and miles away. >> there's no way she could make the call and be bac...

>> cell tower shows it's pinging from up in tuscaloosa. >> wait a minute. how could it be pinging from tuscaloosa? that's miles and miles away. >> right. there's no way she could have made the call and been back to the location where she was murdered at. >> courtesy of the cell towers, you were able to show that teresa could not have made that call. it had to be somebody else using her phone and what do you know? her phone is missing from the crime scene. >> correct. >> so the person who very likely killed teresa mayfield must have used teresa's cell phone to call her husband scott. what could...

Painted wasn't quite what they expected. that morning call to scott, the one he couldn't hear, teresa did not call from moundville. >> cell tower shows that it's pinging from up in us ttuscaloo. >> wait a minute. how could it be pinging from tuscaloosa? that's miles and miles away. >> right. there's no way she could have made the call and been back to the location where she was murdered at. >> courtesy of the cell towers, you were able to show that teresa could not have made that call. it had to be somebody else using her phone and what do you know? her phone is missing from the crime scene. >...

Her husband scott. what could that mean? did the killer know scott? and did scott know something he wasn't sharing? coming up -- >> we were dealing with a person that was leading a double life. >> secrets and lies. >> this was the trail -- >> very good word. >> when "dateline" continues.