The Isabella "Ariel" Kalua murder case has shocked Oahu. Prosecutors say the 6-year-old was tortured and murdered by her adoptive parents, Isaac and Lehua Kalua, who reported her missing in September. The two face an enhanced sentence of life behind bars without the possibility of parole, but experts note there are host of difficulties with the case. The biggest one: Investigators have not found Isabella's remains.

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