The World newspaper of Coos Bay reports that more than a dozen parents complained at a school board meeting this week.
Parents said the third-grader left notes in the desks of several fellow students in November, with messages such as 'You will die" and 'I'm going to kill you."
The teacher discovered the notes and referred the student to the principal.
One parent, Dutch Hauser, alleged that the school principal tried to sweep the incident under the rug because the student's parent is on the school board.
Superintendent Dian Buche denied a cover-up, saying the district followed its safety procedures.