Transcripts for MSNBC Dateline 20220116 08:06:00

>> it was obvious that they were very happy together. very happy. >> his name was henry. at his own photography studio, and donna dropped by one morning, when kit was there. >> she was happy. she was in love. to someone that treated a really good, and was in love with her. they made a great family. >> kit was bursting with plans, and now she was moving to los angeles from orange county, to be closer to her fooling work. and then, that weekend, it was january 1983. decades later would happen that weekend, the mystery of it was in a file on boyd underwood's desk. and a family was thinking back, trying to piece together those incomprehensible events. starting with that first call. >> it was slowly before ten, saturday morning. >> did she pickup? >> no. i don't think anything of it. she was gone for the day, i