Who is Dr Matt Lambert? DC physician who killed luxury apartment building manager then himself in mass shooting

A veteran doctor and medical tech boss went on a shooting rampage in his apartment building amid a bitter legal battle over water damage in his $1 million home.Dr Matt Lambert, 55, shot dead the building manager in the gym of the tower in Washington DC and wounded three others before turning the gun on himself.A close relative of Lambert refused to comment when the Daily Mail called asking about the doctor in connection with the shooting.Lambert had a long-running feud with Metropole Condominium Association, which operates the luxury residential tower on 15th Street near Logan Circle.He claimed in the lawsuit, and in great detail on his Twitter account, that Metropole caused water damage and resulting mold during facade renovations.The disgruntled doctor barricaded himself inside the one-bedroom unit, which was built in 2008 and worth just over $1 million, and later shot himself dead.Lambert's last post, at 8.06am while he was believed to be holed up inside his apartment, read: 'My manifesto is an engineering report.'Attached was a screenshot of part of a report by CED Technologies that agreed with his claims, and what appeared to be a record of reported building issues. Dr Matt Lambert, 55, shot dead the building manager in the gym of the building in Washington DC and wounded three others before turning the gun on himself A Washington, DC, gunman killed himself after an hour-long standoff with police. He barricaded himself in an apartment after killing a man at a nearby gym and injuring four others Another chilling post by Lambert predicted his shocking crime on April 28 in response to a complaint by another resident about the hot water not working.'If you're looking for the building manager, I would check the gym,' he wrote. Lambert in a post the day before the shooting claimed the saga left him with 'no shower, dryer, HVAC, and cooking' for six months.Officials earlier said the suspect had a conflict with his HOA prior to the shooting. 'We do know there was a conflict between him and the homeowners association of that building, but at this point we're continuing to look into that,' Metropolitan Police Chief Jeffery Carroll said at a press conference.A male victim died after being shot in the back inside VIDA Fitness in Logan Circle. The suspect is believed to be a member of the gym, police said.At least one of the injured is in critical condition, while three others sustained non-life-threatening injuries, police said at a late morning news conference, shortly after the shooter turned the gun on himself. Police found him barricaded inside a 15th Street apartment after the shooting, where negotiators spoke with him for roughly an hour before they heard a gunshot. Police forced themselves into the building, where the man reportedly shot at police twice through the door. Once inside, authorities found lambert with a self-inflicted gunshot wound. The inside of Lamber's apartment in November 2024 showing the water damage Remedial work done to Lambert's apartment in a photo from November 2024 that he posted a day before the shooting Lambert's last post read: 'My manifesto is an engineering report.' Attached was a screenshot of part of a report by CED Technologies that agreed with his claims He also attached what appeared to be a record of reported building issuesLambert was in March appointed chief medical officer and head of product strategy at Advantmed, a healthcare information management and risk adjustment company.His focus was to be the company's in-home assessment program.'In-home assessments provide a meaningful opportunity to engage members while strengthening risk and quality performance,' Lambert said at the time.Lambert got his medical degree from Marshall University and trained in emergency medicine before a series of private sector chief medical officer jobs.He was also the chief medical information officer for New York City Health and Hospitals.Lambert began documenting his feud with Metropole in October 2025, posting hundreds of photos, documents, and complaints. His complaints were not confined to his apartment and the disputed over the water damage, but to anything wrong with the building and its operations.Lambert's lawsuit, filed in March 2025, claimed the water damage was a direct result of facade work Metropole began in March 2023.He claimed that before the work began, his apartment had 'no significant water intrusion, mold, moldy smells, moisture accumulation, or related damage'.The construction caused 'suspected water intrusion, mold, significant moisture accumulation, and/or related damage', his lawsuit claimed. A bullet hole seen in a window of the apartment complex A male victim died after being shot inside VIDA Fitness in Logan Circle on Thursday. The suspect is believed to be a member of the gym, police said Witnesses to the horrifying shooting spoke of seeing the building manager gunned down and others nearby wounded, and the panic and chaos that followed. A gymgoer said the scene inside the gym was 'horrific' and people were unable to escape the area where the shooter was without passing him. She said a man near her was shot while she was walking on the treadmill. Max Smith told NBC Washington that he left his apartment after a fire alarm went off. But when residents got outside, they heard gunfire. 'Everyone starts sprinting,' he told the outlet. Smith said he heard at least three to four gunshots and said at least ten people barricaded themselves inside Call Your Mother deli's bathroom. 'I'm very shaken up, you don't expect it,' he told the outlet. More to come.