A man who opened fire at a gym inside a luxury condominium building in Washington DC, killing the building manager and injuring four others, had repeatedly complained about mould and water damage in his apartment before the shooting, police said.
asserted
police → open → shooting
The gunman, identified as 55-year-old Dr Matt Lambert, later shot himself inside his apartment following a standoff with police.
asserted
gunman → identify → police
Three firearms were recovered from the apartment, according to law enforcement sources cited by CBS News.
uncertain
firearms → recover → News
The shooting took place on Thursday morning at the Vida Fitness centre on the ground floor of the Metropole Condominiums in the Logan Circle neighbourhood.
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shooting → take → neighbourhood
Police identified the person killed as 46-year-old James Stuart, who managed the building.
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who → identify → building
An X account under the name @OfMiceandMold, which CBS News linked to Lambert, contained dozens of posts detailing his grievances over alleged disrepair in his apartment.
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News → link → apartment
He had repeatedly criticised the building's contractors and property management company, EJF Real Estate Services, accusing them of failing to address problems with his unit.
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He → criticise → unit
Shortly before the shooting, Lambert posted what he described as an engineering report examining mould and water-related problems in the building.
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he → post → building
"My manifesto is an engineering report," he wrote on X.
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he → write → X.
In an October 1 post, he appeared to refer to the 2024 killing of UnitedHealthcare chief executive Brian Thompson by Luigi Mangione.
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he → appear → Mangione
Lambert wrote: "After months of 'Luigi' tactics (delay, deny, defend) by the HOA, we were finally able to submit an independent engineering report into the record."
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we → write → record
He also said he would share the report on X "when the time is right".
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time → say → X
In another social media post dated April 28, Lambert wrote, "If you're looking for the building manager, I would check the gym."
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I → date → gym
Lambert had filed a lawsuit against the Metropole Condominium Association, alleging damages of more than $290,000 as of May.
uncertain
Lambert → file → May
The association and EJF denied responsibility, arguing that any damage had been caused by third parties beyond their control and that Lambert had failed to limit his losses.
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Lambert → deny → losses
Witnesses describe chaos during shooting
Police said Lambert opened fire inside the building's gym before returning to his apartment, where he remained during a standoff with officers and eventually killed himself.
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he → describe → himself
A woman who was exercising on a treadmill when the shooting began told CBS News that she had to evacuate by passing the area where one of the victims had been killed.
"There was no way of getting out of the gym other than going past that scene," she said.
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she → exercise → scene
Another witness, who lived directly below Lambert and was about 20 feet from the shooting, said the suspect had become increasingly upset during homeowners' association meetings.
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suspect → live → meetings
He said Lambert had previously invited residents into his apartment to show them the condition of the unit.
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Lambert → say → unit
The witness described the 99-unit condominium as a "tight-knit community".
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witness → describe → community
During the shooting and police standoff, his girlfriend barricaded herself inside their apartment.
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girlfriend → barricade → apartment
He said the flat was subsequently left under an inch of water following the firefighting response.
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flat → say → response
Doctor had bought penthouse for $1.1 million
Lambert had purchased the condominium in September 2016 for $1,095,000, according to Washington DC tax records.
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Lambert → buy → records
Court documents showed that he owned a penthouse unit in the building.
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he → show → building
He ran MLEM, a healthcare and technology consultancy, and had studied medicine at Marshall University in West Virginia before completing his residency at West Virginia University, according to his LinkedIn profile.
uncertain
He → run → profile
As per his personal website, Lambert is described as a board-certified emergency physician with more than two decades of clinical experience.
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Lambert → describe → experience
The website also said he had volunteered in underserved communities in Kenya, Belize and Haiti.
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he → say → Kenya
The shooting took place in the Logan Circle neighbourhood, where the Vida Fitness centre catered to residents of the condominium building.
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centre → take → building
Police have identified the building manager as the person killed in the attack, while four others were wounded.
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others → identify → attack
The Aporia
