RAW VIDEO: Opening Arguments in Aaron Schaffhausen Trial

Updated: 04/04/2013 1:57 PM KSTP.com By: Cassie Hart

Opening statements were heard from the defense in the insanity trial of a man who admitted last week that he killed his three daughters in their River Falls home.

Thirty-five-year-old Aaron Schaffhausen pleaded guilty to three counts of first-degree intentional homicide, but he maintains he is not responsible because of a mental illness.

Public defender John Kucinski called the murders a "horrible, tragic act" but blamed them on an "extremely rare and complex condition" that he says runs in the Schaffhausen family.