all of her friends because they changed a lot depending on who she was hanging out with at the moment. but it wasn't familiar at all. >> reporter: a police officer came and took a report. james, meanwhile, called up the gps function on annie's cell phone. >> it put her around or about the golf course out in riverton and within a mile of that, which is around the bridge area. >> reporter: the bridge at the jordan river, just a couple miles from their home, a place joggers and horseback riders frequent during the day and young lovers at night. james, veronica and the officer watched as annie's phone pinged across the computer screen in realtime. you're watching her move. >> yes. >> when it moved so fast, our immediate assumption was, okay, she's getting in a car. >> reporter: so this is a hot pursuit now, looking for your girl? >> yep. >> reporter: and then the signal just stopped. veronica drove to a walmart near where they'd tracked annie's phone. >> and i have her picture on my cell phone. and i'm showing it to the people that are sitting at the front,