Widow of Pulse Nightclub Killer Goes on Trial, a Challenge for Prosecutors

Federal prosecutors will face a number of challenges when the trial of the only person charged in the 2016 Pulse nightclub shooting, one of the deadliest in American history, begins on Thursday.

Noor Salman, the 31-year-old widow of the gunman, Omar Mateen, is accused of aiding and abetting her husband in advance of the attack, in which he killed 49 people and wounded 53. Prosecutors say she also later lied to the F.B.I. about what she knew about her husband’s plans.

Ms. Salman, who faces life in prison if convicted, has denied any involvement in or prior knowledge of Mr. Mateen’s plans to gun down dozens of people in the name of the Islamic State. Mr. Mateen was killed by law enforcement officers during a standoff after the shooting.