(CBS/AP) TUCSON, Ariz. - Jared Loughner, the suspect in the Arizona shooting rampage that left six dead, pleaded not guilty to dozens of new federal charges, including that he tried to assassinate U.S. Rep. Gabrielle Giffords, attempted to kill two of her aides and murdered federal judge John Roll and Giffords staffer Gabe Zimmerman.
He also is charged with causing the deaths of four others who weren't federal employees, causing injury and death to participants at a "federally provided activity" and using a gun in a crime of violence.
Loughner also will likely face state charges stemming from the Jan. 8 attack at a Giffords event outside a Tucson grocery store.
Loughner, whose once-shaved head is now covered with short, dark hair and sideburns, smiled as he was led into the courtroom Wednesday and entered his plea before U.S. District Judge Larry Burns and entered the plea Wednesday.
Loughner's father also attended the proceedings and listened to the new charges against his son with his arms crossed, head down and eyes closed.
Also in attendance were more than 20 U.S. Marshals and security personnel, numerous reporters, about a dozen family members of victims and at least two survivors of the Jan. 8 shooting spree, Susan Hileman and U.S. Army Col. (Ret.) Bill Badger.