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He admitted going to a “Congress On Your Corner” event armed with a loaded Glock 19 pistol and 60 additional rounds of ammunition with plans to kill Giffords.
Loughner shot her through the head at close range. Six people were killed, including U.S. District Judge John Roll and 9-year-old Christina-Taylor Green.
Loughner also admitted shooting the others with the intent to kill.
Court-appointed experts said Loughner suffered from schizophrenia, disordered thinking and delusions. He was determined unfit to stand trial in May 2011 after he disrupted court proceedings and was dragged out of the courtroom.
Loughner later was ruled mentally competent to stand trial after being treated for psychosis at a U.S. Bureau of Prisons psychiatric hospital in Springfield, Missouri. He then agreed to plead guilty.
Few clues to the motives for the attack have emerged. Prison psychologist Christina Pietz has testified that Loughner had expressed remorse for the rampage and especially for the 9-year-old girl’s death.