WASHINGTON, D.C., Nov. 12, 2026 — The suspected gunman in Thursday’s deadly shooting at a Washington, D.C., fitness center has been identified as Dr. Matt Lambert, an emergency medicine physician who had been involved in a lengthy legal dispute over alleged mold and water damage in his $1.1 million apartment.
The shooting in the Logan Circle neighborhood left one man dead and four others injured. Lambert was later found dead from an apparent self-inflicted gunshot wound inside his seventh-floor penthouse apartment, according to police.
Authorities are investigating whether the violence was connected to Lambert’s dispute with the condominium association responsible for managing his building.
Years of Complaints Over Mold and Water Damage
According to court records reviewed by the Associated Press and New York Post, Lambert filed a lawsuit against his condominium association in 2025, alleging that construction and repairs to the building’s exterior had caused extensive water intrusion and mold problems inside his apartment.
Lambert claimed that the conditions had made his penthouse unusable since 2024. His complaints included persistent moisture, suspected black mold, leaks, and other maintenance problems.
The legal dispute remained unresolved at the time of the shooting, with mediation scheduled for March 2027.
Lambert had also discussed the building’s condition publicly on social media. Shortly before Thursday’s shooting, an X account associated with him reportedly published an engineering report describing suspected mold growth, water damage, and proposed repairs.
The New York Post reported that the property was valued at approximately $1.1 million.
The existence of the lawsuit and online complaints does not establish that the dispute caused the shooting. Police have not announced a definitive motive.
Gunfire Erupts at Busy Fitness Center
The violence began around 8 a.m. Thursday at VIDA Fitness, located near 15th and P Streets NW in Washington’s Logan Circle neighborhood.
Approximately 50 people were exercising inside the gym when gunfire erupted.
One man was fatally shot inside the facility. Four others were wounded in or near the surrounding buildings, including one person reported to be in critical condition.
Witnesses described hearing gunshots, seeing an injured man on the floor, and rushing to evacuate as emergency alarms sounded.
Police and emergency responders arrived within minutes, while nearby streets were closed and residents were instructed to shelter in place.
Suspect Found Dead After Police Standoff
Following the shooting, the suspected gunman retreated to his penthouse apartment in the nearby residential building.
Police surrounded the property, and negotiators established telephone contact with him.
According to Metropolitan Police Department Interim Chief Jeffery Carroll, officers later heard a gunshot from inside the apartment. When they entered, they found Lambert with an apparent self-inflicted gunshot wound.
He was pronounced dead.
The incident triggered a large response involving local police, tactical officers, and federal law enforcement agencies.
Authorities are examining Lambert’s legal dispute, his communications before the shooting, and the circumstances surrounding the victims.
D.C. Councilmember Brooke Pinto said preliminary information suggested that the gunman had targeted someone inside the fitness center, although investigators have not publicly established the full circumstances of the attack.
The identity of the man killed in the gym had not been publicly released in the reports available Thursday afternoon.
Sources: Associated Press, November 12, 2026; New York Post, November 12, 2026; NBC Washington, November 12, 2026; Metropolitan Police Department statements.
By NJ RADAR Team