- Associated Press - Wednesday, December 2, 2015

SALEM, Mass. (AP) - A psychiatrist testifying at the trial of a Massachusetts teenager charged with killing his math teacher says the teen suffered from psychosis.

Sixteen-year-old Philip Chism is charged with rape and murder in the October 2013 slaying of 24-year-old Danvers High School teacher Colleen Ritzer.

Dr. Anthony Jackson of Worcester Recovery Center and Hospital says Wednesday that after Chism arrived at the hospital Oct. 15, he was diagnosed as having “brief, transient psychosis” triggered by the stress of the trial.

The diagnosis indicates the person’s ability to deal with reality was impaired.

Jackson says his diagnosis pertained to Chism’s condition in October this year.

The testimony comes as defense lawyers have begun presenting the insanity defense on the teenager’s behalf. Prosecutors rested their case Monday.

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