15-year-old Arkansas boy held on $750K bond in sister's shooting death

(CBS/AP) RUSSELLVILLE, Ark. - A 15-year-old accused of fatally shooting his older sister at their family's rural Arkansas home stood before a judge by himself Tuesday and was ordered held on $750,000 bond, a prosecutor said.

Prosecutor David Gibbons told the Associated Press Tuesday that he plans to charge the boy with first-degree murder as an adult by the end of next week "because of the nature of the crime." 

The boy's next court date is March 1.

According to Franklin County Sheriff Anthony Boen, the teen shot his 16-year-old sister multiple times at the family home near Ozark. Boen says the boy walked into the sheriff's office and admitted to the shooting around 9:30 a.m. Sunday, reports CBS affiliate KTHV. Authorities say the teens' parents were out shopping at the time of the incident.

"He just said that he had just shot and killed his sister," said Boen. "...He didn't give a motive."

Boen said he didn't believe the girl's death was accidental, although her brother appeared remorseful and had tears in his eyes when he turned himself in. Authorities are treating the death as a homicide.

The boy, who's name has not been released, was in custody in nearby Sebastian County because Franklin County isn't set up to house juveniles, Boen said.

The girl's body was sent to the state crime lab, and preliminary autopsy results are expected sometime this week.

Investigators confiscated multiple guns from the family's home and vehicle and were trying to determine which weapon had been used in the shooting.

"Both the dad and the son were avid hunters," Boen said.

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