(TUCSON, Ariz.) -- Before he allegedly went on the deadly shooting rampage in Tucson, Jared Loughner considered every aspect of the assault including the likely punishment, sources tell ABC News.
Loughner, 22, used his home computer to browse a website with information about the effects of lethal injection, according to sources familiar with the investigation. He appeared to want to know what death by injection felt like, the source said.
Lethal injection is the method of capital punishment imposed by the federal government.
Loughner also allegedly browsed the Internet for information about solitary confinement and, perhaps more disturbingly, an official said, he had been researching political assassins.
It all paints a dark picture of cold-blooded forethought, sources said, and an obsession with assassinating Rep. Gabrielle Giffords, D-Ariz., who was shot in the head but survived the attack.
Six died and several others, including Giffords, were injured in the Tucson attack on Jan. 8. The congresswoman now is recovering in a Houston brain rehabilitation hospital.
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