A teenager who raped and killed his maths teacher while at school faces life in prison after being convicted.
Jurors today found Philip Chism guilty of first-degree murder in the death Colleen Ritzer as Danvers High School in Massachusetts.
The teenager’s defence lawyers claimed he was in the midst of a psychotic episode when he stabbed her 16 times in the neck in the women's bathroom.
Prosecutors said the schoolboy, who was 14 at the time, used a box cutter to brutally stab the 24-year-old, before using a recycling bin to take her body into the woods.
Once there he raped her and violated her with a wooden stick before abandoning her half-naked.


