one of them was keri cooper, the class instructor. she also went over to the house.ns out keri knew as much about crime scenes as she did about dance moves. that's because keri's a cop in nearby memphis. >> well, i kind of took on that police officer role at that moment and i combed like every inch of her property. >> was there anything? >> i found nothing. and i looked through her storage sheds and i looked all along the railroad tracks behind her house and there was nothing. >> the afternoon heather disappeared, chris came to the police station wanting to help. >> you've been up all night. >> okay. >> i mean, i can't miss an opportunity -- i didn't want to mace a call, i didn't miss a chance. i thought she was going to come by. i didn't want to miss a knock on the door. >> sure. >> i'm worried. >> chris told detectives something that could be vital to the investigation. he said heather had written him an email the night before. the subject read, i'm sorry. in it she mentions their little girl ava. it read, come get ava. i cannot face everyone with this. please forg