wasn't that. at the center of this human cyclone of distrust is a young mom who worked in that plant. heather bogle worked overnights. one eight-hour shift after another. a single parent with a singular mission. >> her main focus was always her daughter. >> heather's younger sister, jen. >> she wasn't too concerned about getting into a relationship. it was more being responsible and taking care of her kid, making sure she was working enough hours to support them both. >> you look up to her? >> yeah, she was more like a parent to me than she was a sister. >> even though she was only 18 months older? >> yeah,'cause she always looked out for me. >> at 28, heather bogle was mostly looking out for her 5-year-old daughter, mckenzie. heather had never married mckenzie's father, and sister jen says heather's romantic life had never really worked as well as her professional one. >> there was definitely a lot of guys who wanted to be her