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>> in a quiet rural township in michigan, as october chilled into autumn, two young women prepared for the social event of the season. >> it's gonna be great. there will be so many people. >> so they imagined. , so they hoped, in their naivete. then so many others of a particular demographic of the farms and in the small towns around moran county. >> it was a buildup that whole summer that we coordinate way to go to the halloween party. >> halloween! becky brinson and her friend chelsea bruck just loved dressing up for halloween. chelsea and becky worked together at a restaurant call...

>> i had to find her. i just -- you know, what do you do? i mean i couldn't live with myself just sitting at home and hoping that she turned up. >> chelsea was featured on dateline's own missing in america series. her mother tried to stay positive. >> cannot lose hope. cannot give up. the faith and prayers has given us that hope and if anything it's only gotten stronger. >> but penny and others couldn't quite keep that up. >> i know her sweet mom always had hope, and i know one time i introduced myself and i said, "i was chelsea's friend." and she corrected me, "no, you are chelsea's friend. c...

Mess. it's the first time, i think, ever in my entire life of living here, like, forever that i didn't feel comfortable in my own home. >> outside, investigators took one look at mike's fire-pit and was there something in there? >> they dug through, you know, years of burning stuff. you know, having parties and >> what was that like? >> i kind of shoot my head. they had it all taped off and i think they dug all day looking in -- looking in there. >> nothing. still. was he a person of significant interest? oh, yes. >> absolutely. >> we kept mike -- big mike close. >> but the investigation was a...

Really, maybe, do you think it could be hers? " and i knew who he meant right away. right away. and i'm like, "no. there's no way. all winter? they searched everywhere here. how could they have missed it? how could they have missed it? " >> yeah. >> sheryl called the monroe county sheriff's office and deputies came to pick up the shoe. and the next day det. sroka sent a photo of the shoe to chelsea's mom. >> i'm on the phone with her. i tell her, "i-- i just sent the email to you. did-- did you get it? " she opens it up and she says, "oh, my god, brian, that's her shoe." and it-- it was just s...