SHEBOYGAN, Wis. -

A judge has ruled a 13-year-old Sheboygan boy is competent to stand trial in the killing of his great-grandmother in September.

Judge Timothy Van Akkeren found the boy competent Friday, based on a court-ordered mental health evaluation.

The Sheboygan Press reports the boy's attorney, who requested the evaluation, did not challenge the ruling.

The boy and a 13-year-old friend are charged with first-degree intentional homicide for allegedly bludgeoning 78-year-old Barbara Olson to death at her Sheboygan Falls home on Sept. 17 with a hammer and hatchet.

The boys are accused of ransacking Olson's house and stealing money to buy marijuana and pizza.

Attorneys for the other boy did not seek a competency evaluation.

The case now moves to a January hearing on whether to move the case to juvenile court.