Authorities identified the gunman who killed a building manager and wounded four others near Washington’s Logan Circle as a 55-year-old emergency physician who had spent years battling his condominium association over alleged black mold, water damage and unsafe living conditions.

By yourNEWS Media Newsroom

WASHINGTON — The gunman responsible for Thursday morning’s deadly shooting at a Washington, D.C., fitness center was a 55-year-old emergency room physician involved in a prolonged legal dispute with his condominium association over alleged black mold and water damage, according to police and court records.

Matt Wade Lambert, who lived in a seventh-floor penthouse above the VIDA Fitness center in the city’s Logan Circle neighborhood, fatally shot building manager James Stuart, 46, before opening fire on four additional people from his apartment balcony, authorities said. Lambert subsequently barricaded himself inside his residence and died from a self-inflicted gunshot wound following a standoff with police.

The shooting began shortly before 8 a.m. Thursday, Nov. 12, near the intersection of 15th and P streets NW, approximately one mile from the White House. Police identified a longstanding conflict between Lambert and management of the Metropole condominium building as a possible motive.

“There has been an ongoing dispute between the suspect” and building management, Metropolitan Police Department interim Chief Jeffery Carroll said. “We believe it’s related to that.”

According to The Associated Press, Lambert filed a lawsuit against the condominium association in 2025, alleging that exterior construction work caused water intrusion, excessive moisture and mold contamination inside his penthouse. He claimed the problems had made his residence unusable since 2024.

The lawsuit remained unresolved at the time of the shooting, with mediation scheduled for March 2027.

Lambert, a board-certified emergency physician with more than two decades of clinical experience, had publicly documented his frustration with the property’s condition. He reportedly purchased the luxury condominium for approximately $1.1 million but alleged that prolonged maintenance problems prevented him from using essential household facilities.

An X account believed to belong to Lambert, operating under the name OfMiceandMold, featured extensive complaints about water damage, rodents, mold and the building association’s handling of repairs.

In a message posted Wednesday, the account described “Two years of living in luxury (and the start of 6 months with no shower, dryer, HVAC, and cooking).”

Shortly before Thursday’s attack, the account reportedly shared an engineering assessment concerning moisture intrusion and suspected microbial growth.

“My manifesto is an engineering report,” the account stated, according to reporting by the New York Post.

The engineering materials described alleged damage to walls and other interior surfaces, although the precise extent of mold contamination had not been independently established.

According to City Cast DC’s examination of the condominium lawsuit, Lambert alleged that construction work on the building’s exterior allowed water to enter his apartment, resulting in more than $100,000 in property damage.

The legal dispute reportedly involved repeated disagreements over repairs, maintenance responsibilities and the conditions inside Lambert’s residence.

D.C. Council member Brooke Pinto said investigators believed Thursday’s attack may have been directed at an individual connected to that litigation.

“We believe the suspect walked into Vida to target somebody that he had been in active litigation with, over a condo issue,” Pinto said.

Police identified Stuart as the building manager and the person killed inside the gym. Four additional victims, two men and two women, were wounded when Lambert fired from his seventh-floor balcony. One remained in critical condition Thursday afternoon, while the others sustained injuries that were not considered life-threatening.

Witnesses described scenes of panic inside the crowded fitness center.

James Spellman, who was exercising when the attack began, said approximately 50 people were inside the gym.

“Within seconds there was a man who fell to the ground, and a pool of blood came out,” Spellman told the Associated Press. “One gym member rushed to help him. He was instantly dead. He had been shot in the neck.”

Police arrived within seconds of receiving emergency calls and established a security perimeter around the building as additional reports of gunfire emerged.

Lambert retreated to his penthouse, where officers attempted to negotiate his surrender for approximately an hour. During the standoff, he allegedly fired twice through his apartment door toward responding officers, although no police personnel were injured.

Investigators also reported that Lambert damaged a gas line and started a fire inside the residence. The building’s sprinkler system extinguished the flames, but the resulting fire and water damage forced residents to evacuate.

According to additional New York Post reporting, Lambert contacted a neighbor during the standoff and acknowledged his involvement in the shooting.

Officers eventually heard a gunshot while communicating with Lambert. They entered the apartment and discovered that he had fatally shot himself.

Investigators recovered a handgun, rifle and shotgun from the residence.

The shooting triggered a substantial law enforcement response involving Metropolitan Police officers, tactical teams and federal authorities. Nearby schools were temporarily placed on lockdown, and residents were instructed to shelter in place while police secured the surrounding streets.

The Metropole building was subsequently declared temporarily uninhabitable because of fire damage, sprinkler activation and interrupted utility services. Residents were permitted limited access to retrieve essential belongings while officials assessed the property.

Washington Mayor Muriel Bowser described the attack as a devastating incident of gun violence and expressed condolences to the victims and their families.

Lambert’s professional background added another dimension to the investigation. His personal website described him as an experienced emergency physician with interests extending into technology, public policy and philanthropy.

His medical training and employment history did not indicate that he had previously been involved in violent criminal activity, and authorities had not announced evidence of additional accomplices.

Although investigators believe the condominium dispute was connected to the attack, the precise sequence of events leading to the shooting remains under investigation.

Police have not established that Lambert’s allegations against the condominium association were accurate or that any particular individual was legally responsible for the conditions he described.

The case has drawn attention because of the apparent escalation of a civil property dispute into a deadly attack against building personnel and bystanders.

As investigators review Lambert’s communications, firearms and litigation history, authorities are working to determine the extent to which the ongoing condominium conflict influenced his actions and whether warning signs preceded the violence.

The attack left one victim dead, four others injured and dozens of residents displaced, bringing a deadly conclusion to the doctor’s yearslong dispute over conditions inside his Washington condominium.

Original article