the extra income that i get from airbnb has been a huge impact in my life. welcome back to "dateline extra." heather jones had transformed her life and her body. a devoted teach she, was never absent, so where was she? an e-mail she sent the night before her disappearance offered clues. here's again is andrea canning with "the last dance." >> reporter: when heather jones, the newly svelte, newbie teacher, didn't show up for her kindergarten class that morning back in april 2013, alarm bells went off among her fellow teachers and friends. >> heather would never miss a day of school. she was totally dedicated. >> reporter: home sick? it didn't seem likely. best friend melissa smith knew heather wasn't about to be sidelined by a little sniffle. >> there was no excuse for her not to be there. >> reporter: school officials couldn't reach heather on the phone, and when her cousin diane