. >> up in narrowsburg, where katherine novak's beloved red house once stood, the trees glow orange and gold. autumns have come and gone. her mother still mourns the daughter she lost, but remembers the life she lived. >> what you miss most about her? >> her smile, and her hugs. she was a lot of fun, katherine. she enjoyed life a lot. >> that's all for this edition of dateline. i am craig melvin. thank you for watching. >>> hello, i am craig melvin, and this is dateline. >> in the pit of my stomach, i knew something wasn't right here. >> he must have been so, so scared. >> they were so happy at first. >> kevin just fell in love with her. >> but when the marriage went bad, he went missing. >> he just disappeared. >> was this a husband who didn't want to be found? or was this a wife who had something to hide? what had happened behind closed doors? >> she laughed and said, no, there is no affair. >> someone was keeping secrets, and even police couldn't wrap their heads around this one until they found a trail of text. >> we were like, holy smokes, it's right there. >> it sure was. every st