The 14-year-old Massachusetts high school student accused of raping and murdering his math teacher last month was indicted by a grand jury in Essex County court today. He was formally charged with murder, aggravated rape and armed robbery.

Philip Chism, a freshman at Danvers High School, was arrested on October 23rd after cops found the body of his 24-year-old math teacher, Colleen Ritzer, hidden in a recycling bin behind the school building. Chism allegedly admitted to cops that on October 22nd, he "followed Ritzer into the women's restroom, punched her in the face and slashed her throat with a box cutter," before disposing of her body.

Prosecutors also allege that Chism robbed Ritzer, a second year math teacher who was reportedly staying after school to speak with Chism about an exam, of her credit cards, iPhone, and underwear before raping her with an 'object.'

"The indictments returned today detail horrific and unspeakable acts," District Attorney Jonathan Blodgett said in court today. "This is the first step in a long process to secure justice for Ms. Ritzer and her family."

Chism is being charged with murder as an adult; he is being charged as a youthful offender for the robbery and rape charges. He pleaded not guilty in adult court last month. Ritzer's funeral was on October 27th at the St. Augustine Church in Andover; about 1,000 mourners were in attendance.