welcome back to "dateline extra." returning to our story, here again is keith morrison. >> it was a lover's lane. a quiet, dusty, dead-end road miles from main street moundville. a spot so uncommonly traversed a car with engine running, taillights blazing late into the night could go unnoticed. it was here they found teresa mayfield's truck, body inside, gunshot wound to the head. teresa's younger sister broke the terrible news to their mother. >> when i went to the house, mama was sitting in the recliner. i knelt down on my knees and i grabbed her and i said, mama, she's gone. she's gone.