and a secret she was reluctant to share. >> kind of a bombshell. heather was possibly seeing another man. >> what was really behind her sudden disappearance? that would be the most mind-blowing twist of all. >> do you think that heather would still be alive if she hadn't gone through this transformation? >> gosh -- welcome to "dateline." heather jones, a motivational teacher had shed pounds and past. here's andrea cannon with the last dance. there's a place in downtown tennessee. a hotspot not far from nearby beal state. street.