Homicide

Judge rules that teen's confession to killing math teacher can't be used at his murder trial

A Massachusetts judge has ruled that a teenager's confession to police that he killed his math teacher cannot be used in his murder trial.

Judge David Lowy's ruling came Tuesday in the case of 16-year-old Philip Chism. He has pleaded not guilty to killing and raping 24-year-old Colleen Ritzer on school grounds in October 2013.

Chism's lawyers had said police coerced the statement from the former Danvers High School student after he invoked his right to remain silent.

Prosecutors accuse Chism of killing Ritzer in a school bathroom and leaving her body in woods behind the school. He was found hours later walking along a nearby highway.

The judge also ruled that prosecutors cannot use evidence from Chism's and Ritzer's cellphones that were found near a Danvers movie complex.