Law enforcement officials have identified the gunman behind Thursday's deadly shooting inside a Washington, D.C., fitness center as Dr. Matt Lambert, a local doctor who had been embroiled in an apparent dispute with his homeowner's association.
Lambert's identity was confirmed by a pair of law enforcement officials, as well as a person familiar with the matter, all of whom spoke to The Associated Press on condition of anonymity.
According to authorities, the shooter opened fire at around 8 a.m. inside the VIDA gym in the District's Logan Circle neighborhood. One person was killed in the attack and four others were wounded. The gunman was also killed.
Dispatch audio from the response revealed that roughly 30 people sheltered in the gym's basement as the gunfire erupted.
Reporting from The Associated Press indicates the shooter had an ongoing issue with building management at his apartment building, a conflict serious enough that he filed a lawsuit against the company last year.
In the minutes before the violence began, Lambert appeared to take his grievances online. Less than 10 minutes before the first calls about the gunfire came in, an account on X under the name "OfMiceandMold" posted the message, "My manifesto is an engineering report," accompanied by screenshots of that report, according to the AP.
The images shared on the account lay out the dispute between Lambert and the Metropole Condominium Association, pointing to problems described as "mold" and "water intrusion" issues.
The account is filled with numerous posts, photos and videos documenting alleged issues inside the apartment. In one post made at the beginning of October, the account holder called out the HOA for what was described as "months of 'Luigi' tactics" and mentioned submitting "an independent engineering report."
Officials have described the conflict only as an apparent dispute, and the shooting remains under investigation.
