this time conrad truman got the verdict he wanted. ing did they say not? >> he grabbed my arm. are you sure? >> reporter: in the courtroom, conrad's family shared tears of joy. >> i was giggling and crying at the same time. it was weird. >> reporter: on the other side of the courtroom aisle were tears of a different kind. >> i felt my heart sink and i just was in shock. >> reporter: you fainted? >> i did. i couldn't believe there was a situation where that long shot happened, where he would be freed. >> reporter: juror brian christenson said he and his fellow jurors had no choice but to set conrad free. >> i believe that we all pretty much felt that he probably did it. >> reporter: but you voted to acquit. >> we voted to acquit. >> reporter: because you had reasonable doubt? >> we had reasonable doubt. >> reporter: whether you believe mr. truman is innocent or not, those measurements either put an innocent man in prison or let a guilty man go free. >> well, so you're right. but my opinion hasn't changed. do i think he got away with mur

very thing that freed him, reasonable doubt, could also shadow conrad truman for the rest of his life. >>> that's all for this edition of "dateline." >>> i'm craig melvin. >> and i'm natalie morales. >> and this is "dateline." >>> marie was a very loving person. she had a heart of gold. >> reporter: what happened to this woman? >> my job is to be a truth teller and seek out the truth. i wanted to solve it! >> reporter: her case was a mystery for years. the mom with the 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. >> reporter: she'd 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. >> i was like, i'm proud of you, you're finding god. >> reporter: then, one baffling text. and she was gone. >> i go, "i know i probably i watch lot of "law and order," but i just have this gut feeling." >> because i was a mom, i just knew she didn't leave on her own. there was no way she left that baby. >> reporter: two moms at opposit