James von Brunn, the 89-year-old suspected shooter, was indicted in July on seven counts, including first-degree murder, bias-motivated crime and killing in a federal building. Four of the charges make him eligible for the death penalty, if he's convicted.
The arraignment is set for Wednesday in U.S. District Court in Washington.
Von Brunn shot and killed museum guard Stephen T. Johns on June 10, authorities said.
Von Brunn was shot in the face by other guards but survived. He has been hospitalized since the shooting.