>> reporter: absolutely. this was excellent police work. what they did was get surveillance tape of various homes in the area and the surveillance tape showed mollie tibbetts running and this black car stalking her and as a result they were able to come upon this guy, kim jong un to. it was at the same stage that cristhian bahena rivera confessed he had something to do with this and took them to the area over my shoulder where her remains were found. jillian: do we know she had any interaction with this suspect? if he followed her on a jog before? >> that is part of the investigation by law enforcement and they are trying to determine what was the relationship, if he