The man accused of killing federal intern Chandra Levy in Washington in 2001 has pleaded not guilty to charges he threatened a witness in the case.

Ingmar Guandique was indicted this month on counts including obstructing justice after authorities said he conveyed the threats from jail.

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Guandique's lawyer entered a not-guilty plea for him to the new charges during an arraignment Tuesday in D.C. Superior Court.

Guandique has already pleaded not guilty to first-degree murder and other counts filed in April over Levy's death.

Levy vanished in 2001 after completing an internship with the U.S. Bureau of Prisons. Her body was found a year later in Rock Creek Park.

Guandique has been serving a 10-year sentence for separate assaults in Rock Creek Park.