PIERRE, S.D. (AP) — The South Dakota Supreme Court won't hear the appeal of a Pierre teenager convicted of killing a classmate until next month.

Justices were to hear the appeal of 18-year-old Braiden McCahren Tuesday. The hearing was postponed until Jan. 13 due to a snowstorm. McCahren's attorney alleges judge errors in the appeal.

McCahren was convicted in September 2014 of second-degree murder in the December 2012 death of 16-year-old Dalton Williams. McCahren was 16 at the time of the shooting but was tried as an adult. He was later sentenced to 15 years in prison.

Authorities said the shooting happened in McCahren's home after an argument about a paintball incident. McCahren also was convicted of aggravated assault for pointing a shotgun at another classmate and pulling the trigger. The gun didn't fire.

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