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A Hawaiian couple accused of killing their 6-year-old adopted daughter a month before she was reported missing pleaded not guilty on Monday.

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The body of Isabella Kalua, known by some as the birth of Ariel, has not been found.

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A grand jury indicted Isaac and Lehua Kalua on murder and other charges. They appeared via video from jail for a brief court hearing on Monday. His court-appointed lawyers made pleas of not guilty for him.

A judge set the trial for January.

Isabella Kalua was kept in a cage, the sister was not breathing

According to court documents, the older biological sister of the girl adopted by Kalua told a detective that she saw Isabella in a dog cage, had duct tape over her nose and mouth and was not breathing.

Lehua Kalua’s murder charge involves allegedly causing harm to Isabella’s death, Honolulu prosecuting attorney Steve Alm has said, and not taking appropriate steps to seek medical help for her. By not helping Isabella, the husband is charged with what is referred to as murder by omission, Alm said.

Honolulu Crimestoppers said the reward has increased to $15,000 for information about her disappearance or information leading to the recovery of her body.