TUCSON — Jared L. Loughner was sentenced to multiple terms of life in prison Thursday at a court hearing punctuated by raw emotion as former congresswoman Gabrielle Giffords and her husband, Mark E. Kelly, confronted the man who shot her in the head at close range during a rampage last year that left six people dead and 12 others wounded.

As a packed courtroom fell silent, Kelly, with Giffords at his side, told Loughner, 24, that he had failed in his effort to create a world as dark as the one he inhabited.