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>> and i'm natalie morales >> and this is "dateline". >> marie was a very loving person she had a heart of gold. what happened to this woman? my job is to be a truth teller and seek out the truth i wanted to solve it >> her case was a mystery fo years. the mom with a tender heart an tough as nails career. >> she was part of the sheriff 's department. her ultimate goal was to try t get into the fbi >> she found a new sense o purpose in the church. her pastor and his wife, lik family >> they had taken her in they were helping her out. >> it's like, i'm proud of you you're finding god >...

she had a heart of gold. what happened to this woman? my job is to be a truth teller and seek out the truth. i wanted to solve it. >> her case was a mystery for years. the mom with a tender heart and tough as nails career. >> she was part of the sheriff 's department. her ultimate goal was to try to get into the fbi. >> she found a new sense of purpose in the church. her pastor and his wife, like family. >> they had taken her in. they were helping her out. >> it's like, i'm proud of you. you're finding god. >> then, one baffling text and she was gone. >> i go, i know, i probably watc...

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Maybe marie wanted it all, the baby and james, all for herself. that's what this member of the inner circle believed. >> but i did i hear that from marie, that marie wanted james? >> reporter: did tanya strike back somehow? fight for her marriage by getting rid of marie? listen to how church members quoted tanya's words. >> she basically was like, "james would never be able to do that, but i could." >> and that was -- >> shocker? >> yeah. >> i told him, you're not capable of killing her." but tanya leans over and goes, "well he couldn't, but i could." >> reporter: so wouldn't that lead you to,...

That's what this member of the inner circle believed. >> but i -- did i hear that from marie, that marie wanted james? >> did tanya strike back somehow? fight for her marriage by getting rid of marie? listen to how church members quoted tanya's words.e to do that, but i could." >> shockers? >> yeah. >> i told him, you're not capable of killing her." but tanya leans over and goes, "well he couldn't, but i could." >> so wouldn't that lead you to, like a bloodhound, direct to tanya? she certainly would have a motive. >> she would. >> tanya, now the only mother figure in grace's life. did she know...