The night annie was killed. it s a 1:59 in length. and what really stood out is we see these 25 handoffs. reporter: handoffs, the signal bouncing from tower to tower. but the 25 handoffs were only between these four towers that we were looking at here. reporter: sy created this map of the pings. but the signal strength had to be so similar within those four towers, and a very poor signal at that, that it would cause the handing off that we saw. reporter: eventually they found it, the only spot in town that caused the strange pattern of pings. it was at the jordan river, the very spot where annie was killed. we feel very, very comfortable saying, at 9:01 p.m. on march 10th, the phone was within 100 meters of where we re standing. reporter: of course, a skilled defense attorney could argue just because chris phone was there, didn t mean he was. except for one important detail. it turned out of all the people who could have called chris that night the one who did, at precis
From tower to tower. signal strength had to be similar within the towers and a poor signal that it would cause the handing off that we saw. eventually they found it. the only spot in town that caused the strange pattern of pings. it was at the gordon river, the very spot where spot where anni killed. at 9:01 p.m. on march 10th shall the phone was within 100 meters of where we re standing. it turned out, of all the people who could have called chris that night, the one who did at 9:01 p.m. was annie s mom veronica. that was because of something annie told her earlier that morning. something about chris. he had asked her, what would you do if i asked you to runaway with me? runaway. he was the first person i m calling if anything happens. which she did. without realizing it, helped misplace chris bag shaw at the scene of the crime, right around the time her daughter was