Philip Chism has a not guilty plea entered on his behalf on the additional rape charge . It 's not clear whether 15-year - old will be tried as a juvenile or adult on this count . The difference between or circumstances surrounding the two different rape charges was not immediately clear . He previously pleaded not guilty to aggravated rape , robbery , assault charges . Authorities believe he killed his math teacher at school , then disposed of her body .
Philip Chism has a not guilty plea entered on his behalf on the additional rape charge . It 's not clear whether 15-year - old will be tried as a juvenile or adult on this count . He previously pleaded not guilty to aggravated rape , robbery , assault charges . Authorities believe he killed his math teacher at school , then disposed of her body .