Dr. Matt Lambert identified as the Washington, DC, gym shooter, lost his cool over black mold in his apartment

The doctor ranted about his problems with the HOA on X (OfMiceandMold) and sued Metropole Condominium Association in 2025 over building issues at the $1.1 million penthouse where he lived.

According to the DC police, there was a conflict with the homeowners association that left one person dead and four people injured.

Lambert allegedly targeted someone at Vida Fitness whom he "had been in active litigation with over a condo issue," according to Ward 2 Council Member Brooke Pinto, as reported by the New York Post.

In his suit, the physician claimed his home "experienced suspected water intrusion, mold, significant moisture accumulation, and/or related damage."

He lamented on X about all the problems.

On Wednesday before the incident, he shared his "manifesto," which was "an engineering report."

NEW: Dr. Matt Lambert identified as the Washington, DC, gym shooter, lost his cool over black mold in his apartment. Lambert is accused of killing at least one person before running back to his apartment and taking his own life. The doctor ranted about his problems with the HOA on X (@miceandmold) and sued Metropole Condominium Association in 2025 over building issues at the $1.1 million penthouse where he lived. According to the DC police, there was a conflict with the homeowners association that left one person dead and four people injured. Lambert allegedly targeted someone at Vida Fitness whom he "had been in active litigation with over a condo issue," according to Ward 2 Council Member Brooke Pinto, as reported by the New York Post. In his suit, the physician claimed his home "experienced suspected water intrusion, mold, significant moisture accumulation, and/or related damage." He lamented on X about all the problems. On Wednesday before the incident, he shared his "manifesto," which was "an engineering report."

— Collin Rugg (@CollinRugg)November 12, 2026