SHEBOYGAN, Wis. -

A 13-year-old Sheboygan boy accused of killing and robbing his great grandmother has been ordered to undergo a competency exam.

A judge granted the defense's request for the exam on Monday.

The boy and his 13-year-old friend allegedly used a hatchet and a hammer to kill Barbara Olson at her Sheboygan Falls home last month before stealing jewelry and a car. Her daughter discovered her body in the garage two days later.

WLUK-TV reports (http://bit.ly/Tsn03P) the great grandson is scheduled to return to court Nov. 2 for his competency hearing. That's the same day the friend returns to court for a hearing.

A judge has previously ruled there's enough probable cause for both teens to stand trial in the case. The boys are charged as adults.