Expert Witness Blog
Psychiatry expert Dr. Erik David Knudson examined Aaron Schaffhausen and testified in St. Croix County District Court that he believes Schaffhausen was sane when he killed his three daughters in July. Schaffhausen admits to killing his children but says he is not responsible due to his mental illness. The jury rejected his insanity defense and he was found guilty Tuesday.
The forensic psychiatry expert witness testified that none of the defendant’s diagnoses qualified as legal insanity. Dr. Knudson practices at the Mendota Mental Health Institute in psychiatry and forensic psychiatry.
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