Suspect Jared Loughner pleaded not guilty to charges of attempted assassination of Rep. Gabrielle Giffords (D-Ariz.) Monday, according to the New York Times.
Loughner, 22, is accused of an attack on Jan. 8 that killed six and injured 13, according to the Washington Post.
The New York Times said Loughner did not speak during the arraignment overseen by Judge Burns, but smiled throughout the proceedings.
Loughner will be indicted soon in the deaths of two federal workers on official duty and is likely to be charged in the shootings of non-federal employees, said The Washington Post.
Rep. Giffords was flown to an intensive care unit at Mermorial Hermann hospital in Houston, Texas Friday, reported the New York Times.