The wife of the gunman who killed 49 people at a gay nightclub in Orlando, Florida, last year was due in court on Tuesday, accused of misleading authorities investigating the deadliest mass shooting in modern U.S. history.

A federal indictment unsealed on Tuesday showed Noor Salman, 30, who was arrested on Monday in California, is charged with obstructing justice and aiding and abetting husband Omar Mateen's attempt to provide material support to a terrorist organization.

Salman, whom media reports said had been living in the San Francisco area, was to appear in federal court in Oakland, California, on Tuesday.