A veteran physician and healthcare technology executive went on a shooting rampage at his Washington, DC, apartment building amid a bitter legal dispute over water damage in his $1 million home.
Dr. Matt Lambert, 55, shot and killed the building manager inside the tower’s gym and wounded three other people before taking his own life.
A close relative of Lambert declined to comment when Our News Outlet contacted them about the shooting.
Lambert had been embroiled in a prolonged dispute with the Metropole Condominium Association, which manages the luxury residential building on 15th Street near Logan Circle.
In a lawsuit and in extensive posts on his Twitter account, he alleged that facade renovations carried out by the association caused water damage and mold inside his apartment.
The disgruntled doctor barricaded himself inside the one-bedroom unit, built in 2008 and valued at just over $1 million, before fatally shooting himself.
Lambert’s final post, published at 8:06 a.m. while he was believed to be sheltering inside the apartment, read: “My manifesto is an engineering report.”
He attached a screenshot from a CED Technologies report that appeared to support his allegations, along with what appeared to be a log of reported problems at the building.
Dr. Matt Lambert, 55, shot and killed the building manager inside the Washington, DC, tower’s gym and wounded three others before taking his own life
A Washington, DC, gunman killed himself after an hour-long standoff with police. He barricaded himself inside an apartment after killing a man at a nearby gym and injuring others
In another disturbing post, Lambert appeared to foreshadow the shooting on April 28, responding to a resident’s complaint that the building’s hot water was not working.
“If you’re looking for the building manager, I would check the gym,” he wrote.
The day before the shooting, Lambert claimed the dispute had left him without a working shower, dryer, HVAC system or cooking facilities for six months.
Officials had earlier said Lambert was involved in a conflict with the building’s homeowners association.
“We do know there was a conflict between him and the homeowners association of that building, but at this point we’re continuing to look into that,” Metropolitan Police Chief Jeffery Carroll said at a news conference.
A male victim died after being shot in the back inside VIDA Fitness in Logan Circle. Police said the suspect was believed to be a member of the gym.
Police said at a late-morning news conference that at least one injured person was in critical condition, while three others suffered non-life-threatening injuries. The update came shortly after the shooter turned the gun on himself.
Officers found Lambert barricaded inside an apartment on 15th Street after the shooting. Negotiators spoke with him for about an hour before police heard a gunshot.
Police then entered the building after Lambert reportedly fired twice through the door. Inside, officers found him suffering from a self-inflicted gunshot wound.
The inside of Lambert’s apartment in November 2024, showing the water damage
Remedial work carried out in Lambert’s apartment, shown in a photograph from November 2024 that he posted a day before the shooting
Lambert’s final post read: “My manifesto is an engineering report.” He attached a screenshot from a CED Technologies report that appeared to support his claims
CHECK THIS OUT: Retired Montana Car Dealer Wants to Buy an ‘Eternal’ Cruise Ship
He also included what appeared to be a record of reported problems at the building
In March, Lambert was appointed chief medical officer and head of product strategy at Advantmed, a healthcare information management and risk-adjustment company.
His work was set to focus on the company’s in-home assessment program.
“In-home assessments provide a meaningful opportunity to engage members while strengthening risk and quality performance,” Lambert said at the time.
Lambert earned his medical degree from Marshall University and trained in emergency medicine before moving into a series of chief medical officer roles in the private sector.
He also served as chief medical information officer for New York City Health and Hospitals.
Lambert began publicly documenting his dispute with Metropole in October 2025, posting hundreds of photographs, documents and complaints.
His grievances extended beyond the alleged water damage in his apartment, covering a wide range of problems he said affected the building and its management.
In a lawsuit filed in March 2025, Lambert alleged that the water damage resulted directly from facade work that Metropole began in March 2023.
Before the renovation, he claimed, his apartment had “no significant water intrusion, mold, moldy smells, moisture accumulation, or related damage.”
The construction led to “suspected water intrusion, mold, significant moisture accumulation, and/or related damage,” according to the lawsuit.
A bullet hole visible in a window of the apartment complex
A male victim died after being shot inside VIDA Fitness in Logan Circle on Thursday. Police said the suspect was believed to be a gym member
Witnesses described the terrifying moments after the building manager was shot and other people were wounded, recounting scenes of panic and confusion.
One gymgoer called the scene “horrific,” saying people could not leave the area where the gunman was positioned without passing him.
She said a man near her was shot as she walked on a treadmill.
Max Smith told NBC Washington that he left his apartment after a fire alarm sounded. Once residents were outside, however, they heard gunfire.
“Everyone starts sprinting,” he told the outlet.
Smith said he heard at least three or four shots and that at least 10 people barricaded themselves inside the bathroom of Call Your Mother deli.
“I’m very shaken up. You don’t expect it,” he told the outlet.
More to come.
