A teenager charged with killing four students at a US high school will pursue an insanity defense, his lawyers said in a notice filed today as he, his parents and school officials faced a new lawsuit over the attack at Oxford High School.The notice, listed in a summary of case filings available online, should lead to mental health exams of 15-year-old Ethan Crumbley, who is charged as an adult with murder and other crimes for the shooting, which also wounded six other students and a teacher at the Michigan school.Experts will consider whether the teen understood the wrongfulness of his conduct on the day of the shooting.
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