DC gym shooter ID’d as Dr. Matt Lambert — who went berserk at HOA over black mold in his $1.1M apartment

Detailed summary

The emergency room doctor had sued Metropole Condominium Association in March 2025.

The gunman in the early morning Washington, DC, gym shooting has been identified as a well-heeled doctor who was battling his homeowners’ association over black mold in his $1.1 million apartment and railed about it on X.

Dr. Matt Lambert, an emergency room doctor, had sued Metropole Condominium Association in March 2025, alleging that repairs to the building, which involved it being surrounded by scaffolding and drapes, led to mold festering in his home.

“Two years of living in luxury (and the start of 6 months with no shower, dryer, HVAC, and cooking),” an X account linked to Lambert posted Wednesday, along with pictures showing renovations in the Logan Circle unit.

Lambert, who lived on the seventh floor of 1515 15th St. NW, opened fire Thursday morning inside the ground-floor gym, killing at least one person. He then ran back up to his apartment and barricaded himself for nearly an hour before he killed himself.

DC police said they were investigating a conflict with the homeowner’s association as the reason behind the shooting, which left one dead and four others injured.

Lambert filed his suit in March 2025, alleging that his home experienced “no significant water intrusion, mold, moldy smells, moisture accumulation, or related damage,” prior to the remediation efforts overseen by the association.

But, after the building was enveloped, his unit “experienced suspected water intrusion, mold, significant moisture accumulation, and/or related damage,” the suit said.

Lambert described himself as “a board-certified emergency physician with over two decades of clinical experience” and a medical tech executive on his personal website.

“He has a deep understanding of healthcare regulations and their impact on technology adoption,” the site says.

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