Matt Lambert, MD, was identified by federal law enforcement officials as the suspected gunman in a November 12 shooting at VIDA Fitness near Logan Circle in Washington, DC, according to NBC Washington. One person was killed, and 4 others were injured and transported to area hospitals.
The shooting occurred at and outside the fitness center near 15th and P streets NW, according to DC Council member Brooke Pinto, who urged residents to avoid the area.
A woman exercising on a treadmill told NBC Washington that she heard gunfire before fleeing the gym with other patrons. The group sought shelter at a nearby Call Your Mother deli.
The suspected gunman subsequently barricaded himself inside a seventh-floor apartment above the gym, prompting a police response involving negotiators and emergency personnel.
Interim Metropolitan Police Chief Jeffery W. Carroll said officers established contact with the suspect before hearing a gunshot and forcing entry into the apartment. Authorities found the suspect dead from an apparent self-inflicted gunshot wound.
"We do believe he was a member of the gym," Carroll said during a police briefing, according to NBC Washington.
The shooting also prompted a shelter-in-place order for the 1500 block of 15th Street NW and security restrictions at nearby schools, where entry and exit were temporarily prohibited.
Investigators were reportedly examining a conflict involving Lambert and his condominium association, although authorities had not established a motive.
Lambert's apparent X account, @miceandmold, documented complaints about the building extending back several years. In a November 11 post, the account described "Two years of living in luxury (and the start of 6 months with no shower, dryer, HVAC, and cooking)." The post included photographs dated November 2024 showing exposed walls, construction equipment, and a partially dismantled interior.
In another post published November 12, the account stated, "My manifesto is an engineering report," alongside images of a document outlining reported building-envelope problems, including water intrusion and issues involving multiple condominium units.
The document referenced problems predating 2023 and additional issues identified after facade and balcony work conducted during 2023 and 2024.
The posts provide a record of the account holder's allegations but do not establish whether the building complaints were substantiated or connected to the shooting. Authorities had not publicly confirmed that the reported condominium dispute motivated the attack.
Sources: NBC Washington, @miceandmold on X, The Associated Press
