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Because that hand print doesnt belong to the man police put in prison. >> the anger just surged through me. >> reporter: now, a mother turns detective. >> her words to me ill never forget were i just want to know what happened to my daughter. >> join in as she hunts for a killer and searches for the truth. >> i wanted to put my fist through the tv. >> it still brings the hair up on on the back of my neck. >> "the confession". hello and welcome to "da "dateline extra" im craig melvin though 18 ...