A 13-year-old Wellston boy accused of fatally shooting his 10-year-old friend with a crossbow in anger has already been charged as an adult with first-degree murder. A judge this week also ordered a psychological evaluation in the case.

A 13-year-old Wellston boy accused of fatally shooting his 10-year-old friend with a crossbow in anger has already been charged as an adult with first-degree murder. A judge this week also ordered a psychological evaluation in the case.

The death happened Oct. 21 in Lincoln County. Authorities say 10-year-old Austin Almanza was fatally struck by an arrow, which traveled through his body and then pierced his 8-year-old brother, Ayden, in the arm.

Part of the autopsy report, which was released by the Office of the Chief Medical Examiner this week, shows Austin's cause of death as being “crossbow bolt wound to the abdomen, perforating,”with manner of death ruled a homicide.

Prosecutors have already charged the 13-year-old boy as an adult, making him one of the youngest ever in Oklahoma to be charged as an adult with first-degree murder.

The boy's name, Shane Brooks, is listed on public access court records in Lincoln County District Court.

At a hearing Thursday in Lincoln County, a judge ordered a psychological evaluation to determine how his case should be handled going forward.

Investigators say the boy told them he accidentally shot his friends with the arrow.

The 8-year-old told authorities he and his brother had gone to work on a treehouse with the suspect, but that Brooks became angry when they tried to leave. The surviving brother said the suspect then shot the arrow.

An uncle of the brothers who told authorities he was within earshot of the incident said he heard the 13-year-old boy say, "I think I murdered him accidentally," according to an affidavit. The boy then "ran home crying."

Lincoln County Sheriff Charlie Dougherty said in October that Austin didn't die "because of an accident."

The 13-year-old boy has been released on $130,000 bail. Under the conditions of his release, there can be no weapons in his home, he must be monitored via GPS, adhere to an 8 p.m. curfew and have no contact with Austin's family.

He is scheduled to appear in court on Feb. 22.

The AP reports that the boy's attorney and mother have declined comment.