Make New York Post a Preferred Source The well-heeled Washington, DC doctor who killed his condo manager in the building’s gym vented online about the state of his condo for 14 months — before exploding this week with the crazed mass shooting that also saw four others hit.
Dr. Matt Lambert, 55, started a dedicated X account, “Of Mice and Mold,” in September 2025 to rant about problems with the Logan Circle apartment he bought in 2016 for $1.095 million.
He used the account to regularly rant about his homeowners association – right up until Thursday, when he posted a “manifesto” to justify gunning down building manager James Stuart, 46, and shooting four others at random before turning the gun on himself.
He had already filed a lawsuit against the Metropole Condo Association by the time he created his X account — alleging his home experienced “no significant water intrusion, mold, moldy smells, moisture accumulation, or related damage” prior to the remediation efforts that started in 2023.
The X account remains a timeline for his deadly fixation on conditions he faced in the Metropole building and his hatred of the condo’s management company, EJF Real Estate Services.
The first post on the page is a photo of the building where he had a seventh-floor apartment.
But later that day he then posted about a “mandatory rodent extermination” in the upscale building.
Lambert initially highlighted water damage to walls, moaned about unfinished facade rehabilitation works at the Metropole building, and rodent infestation – seemingly an effort to hurry condo bosses.
Lambert also shared pictures of himself carrying out moisture-reading tests — which came back with the color red, indicating serious dampness.
In April of this year, however, his posts became more chilling – where he directed one resident to the gym to find the building manager after they complained about no hot water, without naming Stuart.
He also mocked officials for not tackling drafts, adopting the line from Bob Dylan’s 1962 protest song “Blowin’ in the Wind,” where he claimed, “The answer my friend is blowing in the wind.”
Lambert continued to highlight mold and leaks – culminating in a post days before the shooting where he said, “Two days of living in luxury (and the start of 6 months with no shower, dryer, HVAC, and cooking).”
“Two years of living in luxury (and the start of 6 months with no shower, dryer, HVAC, and cooking),” he posted Wednesday, along with pictures of renovations in the unit.
In July, he posted sarcastically, “It’s a good night to have an uninhabitable penthouse.”
“Discontinuous Tyvek should be the name of a punk band- not something listed in the conclusions of a building envelope report,” he fumed last month.
He had forked out $300,000 on home maintenance amid the legal dispute, according to lawyer Joel Braithwaite, who previously represented him in a civil case against the condo association, CNN reported.
Lambert shot and killed Stuart early Thursday before returning to his apartment and shooting from the balcony – striking two women and two men who were on the ground. They were hospitalized. One of the victims is in critical condition.
Anthony Mirones, who was on the treadmill when Stuart was shot, initially thought the sound of gunshots was a bouncy ball popping.
He told NBC he then saw a man who had been severely wounded “in the upper body area.”
Meanwhile, Sahil Kapoor, who was also in the gym, told CNN he saw blood gushing out of the man’s head.
“We all took off running,” he said, recalling the moment he heard shots.
The shooter rushed back to his apartment and barricaded himself inside – posting at 8:06 a.m., “My manifesto is an engineering report.”
He attached a report that cites “suspected microbial growth,” along with water intrusion and a hefty bill to “rehabilitate” the wall of his home.
Cops swooped on the apartment and tried to negotiate with Lambert – but the shooter took his own life after around an hour of talks.
“While our negotiators were communicating with the suspect, they did hear a single gunshot. At which time, the suspect stopped talking to the officers,” Carroll said.
Three weapons were found inside Lambert’s apartment – a shotgun, rifle, and handgun. Cops are now investigating if they were bought legally.
Jeffrey Carroll, the interim chief of police of the Metropolitan Police Department, alluded to an “ongoing dispute” regarding “maintenance issues [and] mold” between the shooter and one of the victims.
