A wealthy doctor who opened fire inside a Washington, DC, gym barricaded himself in his mold-filled penthouse for nearly an hour before taking his own life during a standoff with police, according to a federal law enforcement source. During that time, he even called a neighbor to complain.
Emergency room physician Matt Lambert retreated to his $1.1 million home shortly after killing one person and wounding four others inside the ground-floor gym of his trendy Logan Circle apartment building.
According to the law enforcement source, Lambert first called a neighbor and acknowledged that he had carried out the shooting. He then inexplicably activated the building’s sprinkler system.
Metropolitan Police Department negotiators later reached Lambert by phone. During the call, he reportedly launched into a tirade about his homeowners association, with which he had been locked in a yearslong dispute over black mold.
Lambert soon shot himself inside his seventh-floor residence, the source said.
Police said Lambert killed one person and injured four others at Vida gym, where he is believed to have been a member.
In March 2025, Lambert sued his homeowners association over the alleged dangerous fungus. He also referenced the dispute in a “manifesto” posted to X shortly before the shooting.