Police found suspected gunman Matt Wade Lambert dead inside his apartment from an apparent self-inflicted gunshot wound after the shooting in Washington, D.C. Authorities are also investigating whether he intentionally started a fire inside the apartment using an accelerant.
Interim MPD Chief Jeffrey Carroll said investigators discovered flammable liquids inside the apartment, along with large sections of drywall that had been removed, revealing pieces of wood and the back of the outbuildings. Police believe Lambert may have spilled and ignited a flammable substance, allowing the fire to spread through the building.