Social media account linked to D.C. shooter complained of disrepair, invoked man who killed healthcare CEO

November 12, 2026 / 3:42 PM EST / CBS News

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. Multiple law enforcement sources have identified him as Dr. Matt Lambert.

Police said he shot and killed himself in his apartment after killing at least one person and wounding four others in what law enforcement sources said was a targeted attack.

Three firearms were recovered from his apartment, according to law enforcement sources in 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.

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. CBS News has reached out to EJF Real Estate Services for 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. Court documents show he owned a penthouse unit in the building.

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Original source: https://www.cbsnews.com/entertainment/