monday, the morning michelle saw a suspicious man on the stairs of the apartment building. she warned crystal who went a different way to the garage which might have saved her life for 24 hours. what they didn't learn until much later was that crystal left work crying on that last day of her life. she didn't say anything to her family that night, but she did act differently. >> she went around the room and she hugged everyone. >> and she never did that. >> i think she just didn't wanna worry anyone, and i think she kind of just hoped that everything would work out. what was the matter with crystal taylor? they rewound their mental tape a little further, and there it was. a moment. it happened during their car trip back from texas. >> she was on her phone listening to something. and she put her phone down, and she said, "if anything happens to me, it was derek." >> reporter: derek smyer, the father of her unborn child. did she go into any detail about what he had said to her to make her say that? >> no, she didn't.