Authorities revealed more information Thursday about the gunman in Washington D.C., who was accused of killing one person and injuring four others before turning the gun on himself while barricaded in his apartment, according to reports.
The Metropolitan Police Department issued a critical alert Thursday morning about an active shooting near 15th and P streets Northwest, in Washington, D.C.’s Logan Circle neighborhood.
A D.C. police spokesperson told The Washington Sun that the shooter was at the area’s VIDA Fitness gym, which sits about a mile north of the White House.
Here are five things to know about the suspect.
1. Police identified the shooter as Matt Lambert, 55.
Lambert is a former emergency room doctor and health care technology executive, according to The Washington Sun.
2. Lambert reportedly said he was motivated by an ongoing legal dispute with his condo over mold.
He apparently had a long dispute with his condo building’s management, according to The Washington Post.
“Records show that Lambert had alleged in a lawsuit that the building’s condo association failed to act on his complaints about a mold problem and water damage inside his unit,” The Post reported.
A building manager for the condos, Charelle Ferguson, told The Post that during a phone call after she heard gunshots, he confessed to shooting five people and said he was tired of the mold and water damage at his unit.
He shot four other people with a rifle from the balcony of his seventh-floor apartment.
3. Police believe Lambert targeted the victim.
Lambert shot and killed James Stuart, 46, a manager at the condo building, according to reports.
One victim was in critical condition and three others were hospitalized with non-life-threatening injuries.
4. Lambert told a reporter the legal battle had drained him financially.
Washington Sun reporter Michael Brice-Saddler described how Lambert told the journalist months before the shooting that the legal dispute was “draining his retirement savings and fueling a deepening desperation.”
Brice-Saddler had planned to write about the dispute but had to “abandon” the article after being laid off from the publication in early 2026.
5. Investigators discovered Lambert had started a fire inside the apartment.
Jeff Carroll, interim chief of police for the Metropolitan Police Department, said there was “probably some level of accelerant” found in the apartment, CNN reported.
“We don’t know if it was gasoline or something else. There were some other flammable liquids that were found inside of there, so we do believe there probably was some level of pouring there,” Carroll said.
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