TUCSON, Ariz. (AP) — Jared Lee Loughner agreed Tuesday to spend the rest of his life in prison, accepting that he went on a deadly shooting rampage at an Arizona political gathering and sparing the victims a lengthy, possibly traumatic death-penalty trial.

His plea came soon after a federal judge found that months of psychiatric treatment for schizophrenia made Loughner able to understand charges that he killed six people and wounded 13 others, including his intended target, then-Rep. Gabrielle Giffords.

"I plead guilty," the 23-year-old college dropout said.