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Walsh's insanity defense sits on a recognized medical claim: that a psychotic episode drove the Illinois mother to strangle her 2-year-old son on a holiday weekend.
What makes it harder to sustain is what prosecutors say she was doing before it happened.
Court allegations that Walsh was plotting to poison her husband, Michael Walsh, are now running directly against the defense's portrait of a woman who had lost contact with reality.
Andrea Lyon, a prominent defense attorney who previously served on Casey Anthony's legal team, stated this week that Walsh's actions were driven by mental illness.
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