Loughner pulled up several Web sites about lethal injections and solitary confinement in prison, said the sources, who asked to be anonymous because the investigation is ongoing. He also viewed Internet sites about political assassins, according to an analysis of Loughner’s computer that was completed by investigators last week, the sources said…

Prosecutors hope to use the information they have found on Loughner’s computer, along with notes seized in his home, to indicate that Loughner, 22, was not insane and knew right from wrong. They have turned over to the defense the information they obtained from the computer, as well as discs containing about 250 interviews conducted by investigators.

“The impression investigators have is that he was trying to educate himself on assassinations and also research the consequences,” said one source close to the investigation. The source said Loughner pulled up sites that explained the process and effects of lethal injections.