D.C. Gunman’s Penthouse Grievances Preceded Fatal Police Standoff

WHO:

CBS News US - An X account associated with shooting suspect Matt Lambert contained complaints about conditions in his condo unit.

NY Post - Lambert was described as a wealthy doctor.

The Washington Post - A building manager spoke with the gunman shortly after the shooting.

WHAT:

The Washington Post - The gunman killed one person and wounded four others in Northwest Washington.

NY Post - Lambert opened fire inside a Washington, D.C., gym, barricaded himself in his penthouse, and ultimately killed himself during a standoff with police.

CBS News US - The X account complained about mold, rodents, and disrepair in Lambert’s unit.

NY Post - While barricaded, Lambert called a neighbor to complain.

WHERE:

CBS News US - The complaints concerned a unit in the condo building where Lambert lived.

NY Post - The standoff took place in Lambert’s mold-filled penthouse in Washington, D.C.

The Washington Post - The attack occurred in Northwest Washington.

WHEN:

NY Post - Lambert barricaded himself in the penthouse for nearly an hour before killing himself.

WHY:

The Washington Post - According to a building manager, the gunman attributed the attack to long-running frustrations with the condominium complex’s management.

NY Post - Lambert called a neighbor to gripe while barricaded in his penthouse.

HOW:

NY Post - Lambert barricaded himself in the penthouse during a standoff with police, according to a federal law-enforcement source.

(UPDATED November 13, 2026 04:04 UTC)

A Washington gym shooting killed one person and wounded four before gunman Matt Lambert died by suicide. Lambert barricaded himself in his penthouse during a standoff, reportedly blaming building management frustrations. His X account complained about mold, rodents, and disrepair in his condominium.