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Attorneys: Colo. theater shooting suspect plans insanity plea

James Holmes Courtesy: KDVR

James Holmes Courtesy: KDVR

(CNN) — Attorneys for accused Colorado movie theater shooting suspect James Holmes filed their intent to plead their client not guilty by reason of insanity.

Holmes faces charges in the July 20, 2012, shooting spree that took the lives of 12 people and wounded dozens more at the premiere in Aurora of the Batman movie “The Dark Knight Rises.”

Federal agents have said the 25-year-old former University of Colorado doctoral student planned the attack for months.

His trial is scheduled to begin next February. If convicted, Holmes faces the death penalty.

CNN’s Carma Hassan contributed to this report.