A Hawaii island man, committed to the Hawaii State Hospital as a teenager by reason of insanity for raping and killing a 6-year-old Puna girl, will go to trial in September for allegedly assaulting a female hospital staff member last year.

Circuit Judge Richard Perkins agreed Thursday morning to a deputy prosecutor’s request to transfer Mark Davis Jr. to the Oahu Community Correctional Center from the Kaneohe state mental hospital while awaiting trial.

Davis faces second-degree assault charges for allegedly hitting the female staff member with a padlock in 2009.

The prosecutor’s office said Davis allegedly became upset while he was being placed in restraints, grabbed a combination padlock from a table and struck an occupational therapist in the head several times.

Thursday morning, Deputy Public Defender Ed Harada entered a not-guilty plea for Davis, who did not speak at his arraignment.

His case is scheduled for trial the week of Sept. 6.

Davis was committed to Kaneohe in 2005 following his acquittal due to mental illness after being accused of raping and killing Kauilani Tadeo, his neighbor in Puna. She was George and Tumata Tadeo’s only daughter.

Court documents said Davis exhibited "highly assaultive behavior, often having caused injury to staff" at the hospital, making his release unlikely.

During the Tadeo trial, DNA evidence proved that Davis killed Tadeo. Davis was 14 years old when he was arrested.

Tadeo suffered a blow to the head, numerous stab wounds to her body, rape and strangulation, court documents say.

In 2007, Tadeo’s family was awarded $2.7 million in damages for her rape, torture and murder.

Kauilani Tadeo was a first-grader at Keonepoko Elementary School when she was reported missing from her Hawaiian Beaches home at 6 p.m. Sept. 27, 2001. Her body was found two hours later in an abandoned house in the same neighborhood.

Davis, who was diagnosed as mentally retarded at age 5, took drugs the day of the attack and could not remember it, court documents say.

Davis’ family moved to Hawaii island in 1999. In 2001, the year of the attack, Pahoa High and Intermediate School described him committing "pervasive and continuous" harassment against sixth-grade girls. He was described as "violent" and "a bully with smaller kids."