A 64-year-old worker is dead and three others are injured after a wall collapsed at a construction site on Lafayette Street in Manhattan on Tuesday afternoon.

It was the first construction fatality in the city this year.

“It’s an unfortunate accident and we are going to be investigating to see how this happened,” John Hodgens, the chief of department at FDNY, said.

The city’s Department of Buildings says employees of RJB Contracting Carting Corp. were completing a demolition project on the second floor of 126 Lafayette Street when the rear wall collapsed, pinning one worker under the debris and injuring three others.

The trapped worker was taken to NYC Health + Hospitals/Bellevue but did not survive the injuries.

The Department of Buildings says demolition work began on the three-story building in January.

In February, the department issued a partial stop work order at the site, along with five safety violations.

They included failure to remove hazardous materials and fixtures prior to the start of demolition and storing 50 tons of construction material on the first floor, which was overloading the floor.

Three days later, work was permitted to resume after the contractor corrected the violations.

The Department of Buildings says at this time, it does not appear those violations had anything to do with the collapse.

“This was a permitted process of a demolition and again, thank you to the men and women who responded who attempted to save the lives of those who are involved,” Mayor Eric Adams said.

A full stop work order has been issued for the building after Tuesday’s incident.