The gunman who opened fire at a gym in a luxury condo building in Washington, D.C., Thursday morning had been complaining about mold and water problems in his apartment in the building.
asserted
who → open → building
Multiple law enforcement sources have identified him as Dr. Matt Lambert.
asserted
sources → identify → Lambert
Police said he shot and killed himself in his apartment after
in what law enforcement sources said was a targeted attack.
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sources → say → apartment
Three firearms were recovered from his apartment, according to law enforcement sources in Washington.
uncertain
firearms → recover → Washington
An account on X under the name @OfMiceandMold has served as a repository for complaints about the alleged disrepair of the apartment where Lambert lived.
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Lambert → serve → apartment
In dozens of X posts, he vented his frustration with the Metropole Condominiums' building contractors, EJF Real Estate Services, and his allegations they failed to address problems with his unit.
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they → vent → unit
CBS News has reached out to EJF Real Estate Services for comment.
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News → reach → comment
Lambert, who was 52 and ran a D.C.-based healthcare consultancy, had purchased the condo in September 2016 for $1,095,000, according to D.C. tax records.
uncertain
who → run → records
Court documents show he owned a penthouse unit in the building.
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he → show → building
Before the shooting, he posted what he claimed was an engineering report that investigated mold and water issues in his building.
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that → post → building
"My manifesto is an engineering report," he wrote.
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he → write → ?
At one point, he appeared to invoke
, who shot and killed UnitedHealthcare CEO Brian Thompson in 2024.
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who → appear → 2024
On Oct. 1, he 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," and said he would share the engineering report on X "when the time is right."
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time → write → X
Mangione had written "delay, deny, defend" on the bullets he used in the shooting.
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he → write → shooting
In a social media post from April 28, he wrote: "If you're looking for the building manager, I would check the gym."
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I → write → gym
Lambert sued the Metropole Condominium Association, listing his grievances and alleging damages of more than $290,000 as of May.
uncertain
Lambert → sue → May
The Metropole Condominium Association and EJF denied causing the damage and said any damage was caused by third parties beyond their control and that Lambert failed to limit his losses.
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Lambert → deny → losses
The Metropole Condominium Association and EJF did not immediately respond to requests for comment.
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Association → respond → comment
Police said he carried out the shooting inside the Vida Fitness center on the ground floor of the building, which caters to the building's residents.
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which → say → residents
One woman said she was on a treadmill in the gym when she heard the shots fired.
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shots → say → gym
She described having to evacuate past the scene where one victim was killed.
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victim → describe → scene
she said.
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she → say → ?
A witness who was about 20 feet from the shooting told CBS News that he lived directly below Lambert, and described him as being increasingly upset at HOA meetings.
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he → tell → meetings
He said Lambert used to invite people into his apartment to show them how bad it was.
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it → say → them
The witness called the building a "tight-knit community" with 99 units.
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witness → call → units
The witness said that during the shooting and standoff with police, his girlfriend barricaded herself in the apartment, which is now under an inch of water from the response to a fire at the scene.
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which → say → scene
Logan Circle is a vibrant neighborhood in Washington, D.C., gentrified in the 2010s, with historic architecture and some of the most popular restaurants and bars in the city.
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Circle → gentrifie → city
Lambert was the founder and CEO of MLEM, a healthcare and technology consultancy, according to his Linkedin profile.
uncertain
Lambert → accord → profile
He obtained his undergraduate and medical degree at Marshall University in West Virginia, and completed his residency at West Virginia University, according to his profile
uncertain
He → obtain → profile
The Aporia
