both beautiful, michele and martin macneill. everybody loved smart, charismatic michele from childhood on, said her sister linda cluff. >> she entered different pageants. she won homecoming queen. she did modeling. she was an exchange student in switzerland. she excelled at everything. >> martin did, too, in his own way. took a little while but eventually he became a doctor and then a lawyer and then a leader in his church of the jesus christ of latter day saints. the mormons. before that when this picture was taken, it was just unstoppable love. did they alope or just run off together basically? >> they got married by a justice of the peace. >> they had four children. eventually set up house in a place called pleasant grove in utah and loved their family life so much they adopted four more little kids, three of them from ukraine. alexis from the first set of four, followed her father everywhere, was his little shadow. you kind of idolized him, huh? >> i did. i wanted to follow in his foot steps. i became a doctor because of him

. >> macneill was sentenced to 17 years to life but would not serve in full. in april, 2017, martin died by suicide. the dark ending for the story of a family that began with so much hope. >> that's all for this edition of "dateline." i'm craig melvin. thank you for watching. >>> i'm craig melvin. >> and i'm natalie morales. >> and this is "dateline." >> you had the good cop. you had the bad cop and the polygraph. it felt like "law and order." >> the fire broke out before dawn. in the daylight they found this mother is of two young children dead. >> she lived a very courageous life. she was very bold in the things she did. >> after the smoke cleared, a priss tree lingered. >> we knew she did not die in that fire. she died before the fire. >> who do you look to as the suspect? >> obviously the spouse is the first person you look to. >> but her husband had a clear alibi, and he passed a lie detector test. eventually the case grew cold until this witness came forward with a tale of love and lust gone wrong. >> he took the sweatshirt and wrapped it around her neck. >> but could she be b