Federal Bureau of Investigation Director Robert Mueller said the charges would include the attack on Ms. Giffords and Judge Roll and other victims, with later additional charges likely.
For some context, if the upper range of this number signaled an adverse reaction to a drug and the result was heart attack, the media would be demanding heads roll at the Food and Drug Administration and the government enact an immediate ban.
Mr. Dupnik, a Democrat, is friends with the critically injured congresswoman and had a personal relationship with Judge John Roll, the chief of Tucson's federal bench who was slain in the attack.