Police are investigating a workplace accident that left a Port Jefferson Station man dead Monday night in Calverton.

Riverhead Town police said first responders were called about 8:15 p.m. to Anchor/Oldcastle Precast on Burman Boulevard, where a man was pinned between hangar doors at the facility.

Despite attempted lifesaving measures by a Riverhead Town ambulance crew, Thomas Sevier, 56, was pronounced dead at the scene, police said.

The company is located at the site of the old Grumman complex — housed in one of the former aircraft hangars.

Police said preliminary indications were that Sevier had “attempted to enter the facility through one of the large hangar doors, which was partially open” and that, while doing so, the door closed, pinning him between “two portions of door.”

It was unclear how long Sevier had been pinned before being discovered, but police said two men at the site found Sevier, used a forklift to move the door and then began CPR before the arrival of the ambulance crew.

Owners of Anchor/Oldcastle Precast could not be reached for comment.

Police are asking anyone with information to call detectives at 631-727-4500.

Correction: The victim’s surname was spelled incorrectly in an earlier version of this story. 

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