A doctor who fatally shot his building manager at a luxury Washington, DC, condominium made a disturbing confession moments after the attack. Dr. Matt Lambert, 55, shot James Stuart, 46, in the back inside Vida Fitness in Logan Circle at about 8am on Thursday, and four other people were injured.

Charelle Ferguson, a building manager at the Metropole condominiums, told the Washington Post that she heard gunfire and saw people fleeing in panic as a bystander shouted, 'Somebody was shot in the head.' She ushered frightened residents into her office and began calling people she knew in the building, including Lambert, who answered at about 9am. When she asked whether he was safe, he said he was frustrated by mold and water damage in his unit, which he claimed made it unlivable. 'The only way people will pay attention, you have to do something,' Ferguson recalled him saying. He then allegedly admitted shooting five people, including one of her co-workers, Stuart. 'I couldn't believe what I was hearing,' she said. 'I tried to calm myself down and get as much information from him as I could while keeping him on the phone.'S1S2

Lambert then barricaded himself inside his penthouse at 1515 15th Street, above the gym. While inside, he set off the sprinkler system, started a fire, and complained by phone to a neighbor, another property manager and police negotiators about his feud with the building. He also wounded four random people on the ground, firing from his balcony. Police forced their way into the building, where Lambert reportedly fired twice through the door at officers. Negotiators spoke with him for roughly an hour before they heard a gunshot. Inside, authorities found him with a self-inflicted gunshot wound and recovered three guns, a pistol, shotgun and rifle, none registered to him. At least one of the injured was in critical condition, and three others had non-life-threatening injuries, police said.S1S2

The dispute at the root of the attack had been long-running. Lambert had sued the Metropole Condominium Association, which operates the luxury tower, and its building contractors, EJF Real Estate Services, alleging $290,000 in water damage and resulting mold during facade renovations. He detailed these claims at length on his X account. His final post, published at 8.06am while he was believed to be inside the apartment, read, 'My manifesto is an engineering report,' and included a screenshot of a CED Technologies report that appeared to support his allegations. In an earlier post responding to a complaint about hot water, he had written, 'If you're looking for the building manager, I would check the gym.'S1S2