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>> reporter: coming up -- unsettling doubts about cari's story. was she moving or was she missing? >> i could just feel it in my bones. something wasn't right here. >> i wasnt sure what was going on. >> it scared me tremendously. >> i thought "i've got to do something. ron r. >> reporter: when "dateline" continues. >> reporter: when "dateline" continues. >> reporter: when "da continues. >> reporter: when "da" continues.