DC gym shooting leaves building manager dead; shooter had disputed apartment damage

A gunman opened fire inside a gym in Washington, DC, killing the building's manager. Witnesses described scenes of panic and terror during the attack. The suspect, identified as Dr. Matt Lambert, had reportedly complained about mould and water damage in his apartment before the shooting. He had also been involved in a lawsuit against the condominium association over the alleged damage. The incident ended with Lambert dying by suicide after a standoff with police.