The police added that the suspect later died by suicide.
The gunman, identified as 55-year-old doctor Matt Lambert, opened fire inside a gym before shooting four more people from the patio of his seventh-floor apartment. The incident unfolded in less than five minutes, according to Metropolitan Police Department interim chief Jeffery Carroll.
The victim killed at the gym was identified as James Stuart, 46, the building manager. Three of the other victims suffered non-life-threatening injuries, while a fourth remained in critical condition.
Police said the attack appeared to be linked to a long-running dispute between Lambert and the building’s management over alleged mold, moisture and water damage in his penthouse apartment.
Court records show Lambert had filed a lawsuit claiming the problems had prevented him from enjoying the property since 2024. His lawyer said he had spent more than $300,000 pursuing the case.
Lambert died after shooting himself inside the apartment while police negotiators were in contact with him. Authorities said he was armed with three firearms.
The shooting prompted a major police response, with parts of 15th Street Northwest cordoned off and nearby schools placed under lockdown.
Contributor at SEE News — Sada Elbalad English.
