The Fitbit Alibi - Encore
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(upbeat music) - To most Wisconsinites, Green Bay is the magical place. It's where the Packers play. It's a fun town and everybody knows everybody. Drinking is part of the Wisconsin tradition. - Green Bay is a great downtown pulse and I feel it's relatively safe. Nobody would ever think that something like this would happen in our community. - Continuing coverage tonight of a death investigation in the village of Bellevue. - When I had gotten the news, I just shook. I just shook. - There is police activity in a field. - I was a good friend of Nicole Vanderhiden's. She was my neighbor. We watched each other's kids. She just was a ball of fire. - Nicole Vanderhiden was 31 years old. She was living with her boyfriend, Doug Dietry, and they had just had a baby together. It was Friday, May 20th of 2016. Doug and Nicole decided to go out that night. This was an opportunity for them to go out and have a great time. The night didn't end in a great time. It ended in a nightmare. - Nikki walked off into the darkness that night. She just walked off. She vanished. - That was the last anyone to solve her. - About where was she found? - Right down this embankment. When we arrived on scene on this one, you kinda knew right away it was probably gonna be different. At the scene, that was the most apparent thing, is the trauma to the left side of the face. - When you came here, there was no way to identify. You had no idea who she was. - Not right away, no. - Doug Dietry, he woke up in the morning. Eventually, later that afternoon, he had called the sheriff's officer 9-1-1 to report that his girlfriend did not come home from the night before. - I'm here for a missing person report. - We sent some officers over to her residence to take the missing person report. - So this is not normal behavior for her? - Not at all.
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A suspect in a murder swears he didn’t do it – can his Fitbit prove he’s innocent? "48 Hours" correspondent Erin Moriarty investigates.