A 14-year-old Massachusetts boy has pleaded not guilty to murder, aggravated rape and armed robbery charges in the killing of his high school math teacher.

Philip Chism is accused in the Oct. 22 death of Colleen Ritzer, a popular teacher at Danvers High School. Ritzer's body was found in woods near the school with her throat slit and a note reading, "I hate you all."

Chism had already pleaded not guilty in district court, but the case was moved to Superior Court after he was indicted last month. His attorney agreed Wednesday to a prosecution request that he remain held without bail.

Chism had recently moved to Massachusetts from Clarksville, Tenn.

Police haven't released a motive for Ritzer's killing. Chism's attorney has declined to comment. Ritzer's family was in court Wednesday.

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