PIERRE, S.D. (AP) - A 16-year-old Pierre boy faces additional charges connected to the fatal shooting of a classmate.

Braiden McCahren was originally charged with first-degree murder when he was arrested in the Dec. 18 shooting of 16-year-old Dalton Williams.

KCCR Radio reports that a Hughes County grand jury on Friday indicted McCahren on charges of first-degree murder, attempted first-degree murder and aggravated assault. The indictment takes the place of the original charge.

The station reports that the attempted murder and assault charges stem from allegations that McCahren pointed a gun at a third 16-year-old boy who was also in the house.

McCahren's next court appearance has not yet been scheduled. Prosecutors intend to try McCahren as an adult.

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