From The New York Times:
Court documents filed in the U.S. District Court in Phoenix indicated that evidence seized from Mr. Loughner’s home showed that he had planned to kill Representative Gabrielle Giffords, who was in critical condition with a gunshot wound to the head. Found in Mr. Loughner’s home, F.B.I. special agent Tony M. Tayler Jr. said in an affidavit supporting the charges, was an envelope with the handwritten words, “I planned ahead,” “My assassination,” and “Giffords.”
Again, the full story is here.