BOSTON (WBKO) -- Newly released Court Documents say Massachusetts teen Philip Chism confessed to killing his High School Math Teacher back in October.
They also say the 15 year old said he did not have sexual contact with Colleen Ritzer.
Chism has pleaded Not Guilty to murder, aggravated rape, and robbery charges.
He was indicted on an additional charge of aggravated rape.
He'll be arraigned on the new charge on Thursday.
The new court documents were written to support a search warrant for his smashed smartphone. Authorities want to see if the crimes were recorded.