god. what did i do?" and, "oh, there's that pillow in her -- i'm going to get rid of that pillow," then the arms are already up. >> reporter: and you think that's what happened? >> yes. >> reporter: but then came, perhaps, the most anticipated testimony for the prosecution. lyndsay, curtis' own daughter, took the stand. two times, over a span of eight years, she told police her mother was alive that morning. >> she said she had felt better. >> reporter: but on the stand, with her dad's life on the line, she changed her story. telling jurors she was no longer sure her mom was alive that day. >> don't remember any of it. >> reporter: but it doesn't stick in your memory? >> nope. >> reporter: and yet, detective baird's notes, you do tell him the story about seeing your mother. and then with the videotaped interview with -- detective gibson, you seem quite clear about that morning, and yes, you saw her and went off to school. what had happened in the interim between your statement and going into trial, on the stand, and then kind of stepping back from all of that? >> it was the fact of no one had honestly asked me, sincerely, what had happened that day.