Doctor shared ‘manifesto’ earlier than taking pictures 5 folks after which himself throughout stand off with cops
Disgruntled doctor Matt Lambert, 55, went on a rampage outside a gym in Washington, DC, at around 8am local time. He is believed to have gunned down his building manager
Disgruntled doctor Matt Lambert has been named as the shooter(Image: MattLambertMD/X)
A gunman who shot one person dead and injured five others before turning the gun on himself near the White House has been named. Disgruntled doctor Matt Lambert, 55, went on a rampage outside a gym in Washington, DC, at around 8am local time.
He was said to have been locked in a row with his homeowners’ association over black mold in his $1.1 million penthouse. Cops said he barricaded himself in his flat and “fired through” his door at officers before shooting himself. He later died of his injuries.
Jefferey Carroll, the interim chief of the Metropolitan Police Department, said: “We believe there was some sort of a conflict with the apartment building, but we don’t have much more than that.”
Cops at the scene(Image: Getty Images)
An X account – OfMiceandMold – which appears to belong to Lambert has been unearthed and contains a number of posts about a rodent infestation and leaks in his apartment, where he lived on the 15th floor.
Its final post – just before the gun horror – stated: “My manifesto is an engineering report.” The post contained a screenshot of a list of issues with his building.
In another post, he shared pictures showing renovations and wrote: “Two years of living in luxury (and the start of 6 months with no shower, dryer, HVAC, and cooking).”
Dr Matt Lambert was named as the gunman(Image: curationhealth/X)
Local media reported the man killed in the gym was the building manager, who he appeared to be angry with on the account. Previous posts include one that read: “If you’re looking for the building manager, I would check the gym.”
A “specific person was targeted” with other gym members left unharmed, NBC News reported. It was also reported the shooter fired at officers during attempts to calm the situation.
Lambert, an emergency room doctor, had sued Metropole Condominium Association in March 2025, alleging that repairs to the building, which involved it being surrounded by scaffolding and drapes, led to mold festering in his home.
Interim Police Chief Jeffrey Carroll (Image: Getty Images)
He alleged his home experienced “no significant water intrusion, mold, moldy smells, moisture accumulation, or related damage,” prior to the remediation efforts overseen by the association.
But, after the building was enveloped, his unit “experienced suspected water intrusion, mold, significant moisture accumulation, and/or related damage,” the suit said.
Lambert described himself as a “board-certified emergency physician with over two decades of clinical experience” and a medical tech executive on his personal website.
He is said to have opened fire outside the gym(Image: Getty Images)
The site says: “He has a deep understanding of healthcare regulations and their impact on technology adoption.” He also said he split his time between the “mountains of West Virginia and the Logan Circle neighborhood of Washington, DC.”
After shooting his victim, Lambert locked himself in his apartment. Officers forced their way into the apartment and saw the suspect had what appeared to be a “self-inflicted gunshot wound”, police said.
Interim Chief Carroll that negotiators heard a gunshot while talking to him [the suspect] on the phone, which is “when he stopped communicating with them.”
The incident sparked a huge emergency response (Image: Getty Images)
The incident sparked a huge emergency response and raised security fears as it happened around eight blocks from the White House.
Authorities issued a shelter-in-place order covering significant portions of the area, which includes some of the city’s busiest and most popular neighbourhoods.
Local Council Member Brooke Pinto, who represents and lives in the area, said preliminary information suggests the shooter was targeting someone in Vida Fitness and “that he had been in active litigation with over a condo issue.”
She told local media: “It’s just so sad and so senseless to kill someone over a dispute that should be worked out reasonably.”
