A doctor identified by federal sources as Matt Lambert shot five people inside and near the Vida Fitness gym at 15th and P streets NW on November 12, killing one, then barricaded in his seventh-floor apartment and died of an apparently self-inflicted gunshot, police say. Mayor Muriel Bowser called it a senseless act of gun violence, and Free DC warned Trump would use the tragedy as a pretext to escalate the federal military presence.