Massachusetts schoolboy Philip Chism accused of raping and killing his maths teacher

A 14-YEAR-old Massachusetts boy has been indicted for the brutal rape and murder of his high-school maths teacher.

Danvers High School teacher Colleen Ritzer, 24, was found dead outside the high school last month - killed after what a court prosecutor said was a series of "unspeakable acts".

Philip Chism, one of her students, has today been charged with murder as an adult, along with aggravated rape and armed robbery.

Court documents allege that Chism, armed with a box cutter, robbed Ritzer of credit cards, an iPhone and her underwear before sexually assaulting her with an object and then murdering her.

"The indictments retued today detail horrific and unspeakable acts," Essex County District Attoey Jonathon Blodgett said. "This is the first step in a long process to secure justice for Ms. Ritzer and her family."

The popular teacher's body was found on October 24 in a wooded area alongside the Danvers High School athletics field.

Colleen Ritzer, 24, was found murdered in a woods near Danvers High School,where she taught. Source: Supplied

Her throat had been slashed with a boxcutter.

She had also been punched in the face.

The school's security camera recorded Chism pulling on a pair of gloves.

According to court documents, Chism then allegedly followed Ritzer into a bathroom.

He then dragged her body out of the bathroom in a wheeled recycling bin.

After going home to change his bloody clothes, he went to a Wendy's outlet for lunch and then went to watch a Woody Allen movie at a nearby theatre.

He did not retu home.

That night, both Ritzer and Chism were reported as missing.

He is due in court again later today.