Story highlights "There can never be true justice for the crime committed," says victim's father

A jury finds Philip Chism guilty of first-degree murder in the 2013 killing of Colleen Ritzer

He is also found guilty of armed robbery and aggravated rape

(CNN) A jury in Massachusetts has found Philip Chism guilty of first-degree murder in the 2013 killing of his high school math teacher, Colleen Ritzer.

The jurors in Essex Superior Court on Tuesday also found Chism guilty of aggravated rape and armed robbery. He was found not guilty on a second count of aggravated rape.

Chism was charged as an adult and faces life in prison with the possibility of parole between 15 and 25 years, according to Carrie Kimball Monahan from the Essex District Attorney's Press Office.

He showed no obvious emotion as the verdict was being read. A status date in the case is set for December 22.

Chism, now 16, was charged with killing Ritzer, 24, with a box cutter in a bathroom at Danvers High School on October 22, 2013.

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