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PORTLAND, Ore. (CBS/KOIN) The father of Kyron Horman, the Portland-area boy who mysteriously vanished nearly five months ago, has argued in newly filed court papers that his estranged wife is "severely emotionally disturbed" and should not have custody of their 23-month-old daughter.

PICTURES: Kyron Horman Missing: New Photos

Kaine Horman alleged in court documents filed Monday Terri Horman is an alcoholic who suffers from an "undiagnosed personality disorder" and that giving her custody of their daughter, Kiara, could endanger the child.

He said he fears his daughter may have witnessed an "unimaginable act of horror," according to CBS affiliate KOIN.

Terri Horman was the last person to report seeing 8-year-old Kyron walking toward his second grade classroom after a school science fair June 4.

Kyron Horman's stepmom won't contest husband's push out of ...

She has not been named a person of interest or suspect in the boy's disappearance.

Kaine Horman once again said he believes his wife is responsible for his son's disappearance and Why Does Michael Cook Not See Terri Horman as ... - NewsBlaze ZAS