A U.S. attorney is expected to bring evidence before a federal grand jury to determine whether charges will be brought against Noor Salman, the widow of Orlando nightclub gunman Omar Mateen It may be awhile before this occurs as investigators still need to finish collecting evidence and establishing a timeline for Mateen's activities leading to Sunday's attack Noor Salman has told investigators that Mateen told her he had interest in carrying out a jihadist attack but she denied knowing of any specific plan