HILLSBOROUGH -- On April 20 this year, Alvaro Rafael Castillo, accused of killing his father and firing shots at Orange High School, was admitted into UNC Hospitals in Chapel Hill for psychiatric treatment and evaluation, according to an involuntary commitment custody order signed by an Orange County magistrate.

He was released eight days later, according to court records.

According to an affidavit attached to the commitment order, Castillo told his father and family "that he was going to kill himself." The affidavit signed by an Orange County sheriff's deputy, said "a shotgun was taking from him [Castillo] and he left the house." Deputies found shotgun shells on the teenager, according to the affidavit. According to the affadavit, when taken into custody for transfer to the hospital, Castillo said that "he was not going to go back to the Army and was going to kill himself."

Castillo was recruited for the North Carolina Army National Guard, according to written statement from the guard this morning.

Castillo, a private, entered the guard as a cook in 2004, according to the statement from Maj. Matthew Handley. "He completed Basic Combat Training in Aug., 2005 at Ft. Sill and was awaiting shipment to Advanced Individual Training (AIT) as part of a Split Option enlistment, where a recruit completes Basic Training, returns home and then ships to AIT at a later date," the statement said.

"Prior to his AIT ship date in May of 2006, he was determined to be medically disqualified for military service. Immediately his outprocessing was begun by the North Carolina National Guard. Pvt. Castillo was in a trainee status and never deployed as a member of the North Carolina National Guard."

Following his first appearance this morning in Orange County District Court, Castillo was sent to Central Prison in Raleigh.

Castillo, 19, of 230 Lipps Lane, Hillsborough, was charged with first-degree murder for killing his father, Rafael Huezo Castillo. He was also charged with 10 more counts related to a lunchtime shooting at Orange High School on Wednesday. He was held without bail for the murder charge, and given a $500,000 bond for the other charges, which included three felony charges of possession of weapons of mass destruction.

Before the court hearing, Castillo told reporters that he had been obsessed with a 1999 school shooting in Columbine, Colo. Several teenagers died during the shooting spree by classmates who also killed themselves.

A spokeswoman for the Orange County School District said a drivers education teacher helped an Orange County sheriffs deputy assigned to the school as a resource officer, apprehend Castillo on Wednesday.

Officials did not name the teacher. "That's pretty widely known now," said school district spokeswoman Anne D'Annunzio D'Annunzio. "There was a drivers ed instructor who was involved in the apprehension, whom I understand was a former highway patrolman."

The Orange County sheriffs department said Castillo told them that he had killed his father when he was taken into custody at the school. A search of the family home found the elder Castillo's body, according to authorities.

Staff writer Meiling Arounnarath contributed to this report.