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As the Chris Kyle murder trial continues this week in Stephenville, Texas, it seems appropriate to open this criminal appellate blog with a brief discussion of the Texas affirmative defense of Insanity. The prosecution has already played the videotape judicial confession of Iraqi War vet Eddie Ray Routh, and it is now up to both sides’ medical experts to present evidence as to whether Mr. Routh was insane at the time he shot and killed the famous Navy SEAL Chris Kyle and his friend Chad Littlefield.

In Texas, a criminal defendant may attempt to affirmatively prove that, at the time he committed the charged conduct, he did not know that the conduct was wrong because of a “severe mental disease or defect.” The Texas Legislature has refused to define either of these terms because it’s ultimately a juror’s job, not a doctor’s, to give these terms their “common usage” meaning and to determine if the defendant is legally insane.

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