Minneapolis ? The teenage son of a tribal chairman pleaded guilty Tuesday to a charge for his role in shootings that left 10 people dead on an Indian reservation last March.

Louis Jourdain, 17, pleaded guilty to threatening interstate communications, according to a court docket.

Two other charges – conspiracy to commit murder and conspiracy to commit offenses against the United States – were dropped.

The docket gave few details of the charge, saying only that Jourdain used a computer to conduct interstate communications that “could be taken by an objective observer as threatening.”

Jourdain is the son of Floyd Jourdain Jr., the tribal chairman of the Red Lake Band of Chippewa. He was also a friend of Jeff Weise, who shot and killed nine people before killing himself.