Inside intense hour-long standoff between DC shooter Matt Lambert and cops before killing himself in mold-ridden penthouse

Résumé détaillé

The wealthy doctor who opened fire inside a Washington, DC, gym barricaded himself in his mold-filled penthouse for nearly an hour — and called a neighbor to gripe — before…

The wealthy doctor who opened fire inside a Washington, DC, gym barricaded himself in his mold-filled penthouse for nearly an hour — and called a neighbor to gripe — before ultimately killing himself in a standoff with cops, according to a federal law enforcement source.

During the tense and bizarre confrontation, emergency room doctor Matt Lambert, 55, holed up in his $1.1 million abode shortly after killing at least one person and injuring four in the ground-floor gym of his trendy Logan Circle building.

Lambert first called a neighbor and admitted to the shooting before inexplicably setting off the building’s sprinkler system, according to the law enforcement source.

Metropolitan Police Department negotiators then called Lambert, who launched into a tirade about his homeowners association — which he’d been battling for years over black mold.

Cops on Thursday said Lambert opened fire twice on police outside his door, but fortunately no one was injured.

Lambert also broke the gas line in his fireplace and set a fire — which was thwarted by the sprinkler system he set off.

Shortly after, he shot himself inside his 7th-floor home, the law enforcement source said.

Lambert killed one person and left four others injured in Vida gym, where he is believed to have been a member, according to police.

Lambert filed a lawsuit against his homeowners association in March 2025 over the dangerous fungus, and cited it in a “manifesto” he posted on X shortly before the shooting.

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