Millionaire doctor identified as DC gunman who killed himself after deadly shooting spree

WASHINGTON, DC: A millionaire emergency room physician has been identified as the gunman behind a deadly shooting at a Washington, DC, fitness center on Thursday, November 12, that left one person dead and four others injured.

Dr Matt Lambert, who lived in a luxury condominium in the city and held over two decades of clinical experience, died after shooting himself inside his seventh-floor apartment following the attack.

According to his LinkedIn profile, Lambert founded and served as CEO of MLEM, a consultancy specialising in healthcare and technology.

Investigators are examining a long-running dispute with his homeowners' association as a possible motive behind the shooting.

HOA dispute emerges as possible motive

Lambert had been embroiled in a legal dispute with the Metropole Condominium Association over alleged problems inside his apartment, including water intrusion, dampness and black mold.

In March 2025, he filed a lawsuit against the association, claiming that building renovation work had caused moisture damage and other problems inside his home.

The luxury property was reportedly worth about $1.1 million.

Lambert had also taken his complaints to social media, repeatedly highlighting the apartment's condition and his disagreements with the association.

An X account believed to be linked to him, operating under the name 'OfMiceandMold', reportedly shared a post on Wednesday, a day before the shooting, describing two years of living in luxury followed by six months without a shower, dryer, heating and air-conditioning system or cooking facilities.

In another post published shortly before the shooting, the account reportedly stated: “My manifesto is an engineering report.”

The post also featured screenshots from an engineering document concerning the building.

Authorities are examining the online activity as part of their investigation into what led to the shooting.

Two law enforcement officials confirmed Lambert's identity as the gunman.

Ward 2 Councilmember Brooke Pinto reportedly said the shooter had targeted someone at VIDA Fitness with whom he was involved in active litigation over a condominium issue.

DC shooting sends shockwaves

The shooting unfolded at approximately 8 am at VIDA Fitness in the Logan Circle neighborhood, roughly a mile from the White House.

Lambert reportedly entered the fitness center and opened fire on a person before leaving the premises.

Additional gunshots were subsequently heard outside the building, prompting people in the area to run for cover.

The attack left one person dead and four others injured.

Witnesses described scenes of panic inside the fitness center, where dozens of people had gathered.

As more gunfire echoed through the area, some people reportedly rushed into nearby businesses to find shelter.

After the shooting, Lambert returned to his residence in the building above the gym and barricaded himself inside his seventh-floor apartment.

Police officers surrounded the property as a tense standoff continued for nearly an hour.

Following the negotiation with officers, Lambert shot himself inside the apartment.

Investigators are now looking into Lambert's alleged legal dispute with the condominium association, his social media activity and the engineering report he shared shortly before the shooting.

Authorities have yet to publicly establish a complete account of what prompted the attack.