BREAKING: Authorities Reveal Identity Of Deadly D.C. Gym Shooter | JP

Authorities have now identified the man they say carried out the deadly shooting inside a busy Washington, D.C., gym before opening fire from a condominium patio above it.

One person was killed. Four others were wounded, including one victim who remained in critical condition.

It began shortly before 8 a.m. Thursday, when the Metropolitan Police Department sent out an urgent warning about an active shooter near 15th and P streets in Northwest Washington.

CRITICAL ALERT: MPD is on the scene of an ACTIVE SHOOTING in the area of 15th and P Street, Northwest. MPD’s Emergency Response Team is on scene.

AVOID THE AREA.

— DC Police Department (@DCPoliceDept) November 12, 2026

Police identified the alleged gunman as 55-year-old physician Matt Lambert.

The man killed inside VIDA Fitness was identified as 46-year-old James Stuart, the manager of the condominium building above the gym.

That is the grim center of this case: police believe the first shooting was not random.

NBC4 Washington reported that Interim Police Chief Jeffery Carroll said Lambert shot Stuart inside the gym, returned to his seventh-floor home, and then fired from his private patio at people below.

Four additional people were struck at ground level after the gunfire moved above the street. Three suffered injuries authorities described as non-life-threatening, while a fourth was listed in critical condition.

Carroll said the entire shooting sequence unfolded in less than five minutes. In that brief span, a targeted killing inside the gym became a wider attack on strangers below.

The local outlet also reported that Stuart was the building manager and had been involved in the continuing dispute over Lambert’s condominium. Lambert’s attorney said Stuart was connected to that fight over the condition of the building.

Police stressed that they were still working through the evidence and had not announced a final motive. The chief nevertheless said investigators believed the dispute was related to the violence.

The first gunfire came during the morning rush, with dozens of people inside the Logan Circle gym and pedestrians already moving through the blocks around 15th and P streets.

Lambert then barricaded himself in his apartment as officers and police negotiators converged on the building.

The Associated Press reported that Lambert had three guns and was speaking by phone with negotiators before he died from a self-inflicted gunshot wound.

Police also said he cut a natural-gas line to a fireplace and started a fire inside the unit during the standoff. The building’s sprinkler system contained the flames before they spread farther.

Investigators are examining a long-running fight over Lambert’s condominium. Carroll said police believe that dispute was related to the attack, while making clear that the investigation remains active.

Court records reviewed by the AP show Lambert sued over mold, moisture, and water problems he alleged had kept him from fully using his penthouse since 2024. The litigation remained unresolved, with mediation scheduled for next March.

The AP also spoke with people who were inside the gym. One witness said about 50 people were working out when the first shots were fired, and another said patrons in the cardio area had to pass the fallen victim as they evacuated.

Those accounts show how quickly the targeted killing police described turned into a wider attack on people who had no apparent connection to the condominium fight.

By late afternoon, police said one of those four wounded victims was still in critical condition. Three others had injuries described as non-life-threatening.

Hours before the shooting, an X account tied by current reporting to Lambert posted an engineering report and called it a “manifesto.”

My manifesto is an engineering report pic.twitter.com/B85qOQzioO

— OfMiceandMold (@miceandmold) November 12, 2026

That post may help explain the dispute investigators are tracing. It does not, by itself, establish the full motive or every step that led to the bloodshed.

The Washington Sun spoke with gym members during the first chaotic hours of the response.

One member said he heard a single pop while on a treadmill, saw a victim on the gym floor, and then watched people scramble for cover. Another described hearing additional shots after gym patrons were evacuated and wondering where the new gunfire was coming from.

The eyewitness accounts match the terror of an ordinary morning workout turning into a crime scene in seconds. People who had arrived for exercise were suddenly hiding, evacuating, and trying to understand whether the danger had followed them outside.

The outlet reported that some people fled into a neighboring apartment building after the fire alarm sounded, while others hid behind planters as police searched for the shooter.

Witnesses initially could not tell whether the later gunfire came from an alley or another location. That uncertainty helps explain the sweeping shelter-in-place order and the enormous emergency response that followed.

The early scene stretched well beyond the gym: officers sealed nearby streets, residents sheltered inside, and emergency teams searched a dense block containing apartments, businesses, and morning foot traffic.

Police eventually announced that the barricade had ended and the scene was safe, though streets around the Logan Circle neighborhood remained closed while investigators worked.

Update: The barricade has concluded. The scene is safe. Significant traffic closures remain in place.

MPD is still asking the public to avoid the area.

— DC Police Department (@DCPoliceDept) November 12, 2026

Mayor Muriel Bowser called the loss of life devastating and thanked the first responders who rushed into an extraordinarily dangerous situation.

Now the investigation turns to the evidence left inside the apartment, the weapons, the court fight, the online posts, and the precise chain of decisions that ended with one man dead in a gym and four more people wounded outside.