Fiance is my choice of perp.
What is his motive?
I wonder if someone pulled her into a car in a crime of opportunity (rape or robbery). Years ago a young woman named Julie Love was abducted while walking along a road in an Atlanta neighborhood in the early evening after her broke down. Of course her car was located, but she disappeared without a trace. Her family and friends papered the town with flyers and looked for her for a long time. Her remains and the story of what happened to her only emerged many years later after the estranged girlfriend of one of the men who abducted Julie ratted out him and his accomplice. She was in the car when the poor woman was kidnapped off the street.