Police investigators work around a tent covering the scene of a bicycle death Tuesday in Harvard Square. (Photo: Marc Levy)

A bicyclist died early Tuesday after a crash with a tractor-trailer near the Harvard Square T Station, police said.

The crash took place at approximately 9:42 a.m., and investigators from Cambridge police and fire as well as state police remain on scene, authorities said in press releases roughly an hour later.

The Middlesex District Attorneyโ€™s Office was expected to coordinate the release of information, which did not yet include the name of the bicyclist โ€“ reportedly a man in his 50s. The bicycle, partially covered by a small tent behind where the truck remained parked as noon arrived, did not appear to be a rental.

Commuters should expect delays in the area and seek alternative routes.

Investigators check the engine of a truck involved in a fatal collision Tuesday with a bicyclist in Harvard Square, while a police photographer captures details. (Photo: Marc Levy)

The โ€œoperator of the tractor-trailer involved in the crash did remain on scene,โ€ police said. The markings on the tractor-trailer identified it as being fromย Gabyโ€™s Elite Transport out of Rio Rancho, New Mexico. A couple of hours after the crash, a giant Coadyโ€™s tow truck was on hand to remove the tractor-trailer, apparently waiting until after investigators finished their poring over of the exposed engine, and until after police photographers finished their work.

It was roughly 11 months ago โ€“ย at approximately 6:53 a.m. Sept. 17, 2019 โ€“ that a truck driver fatally struck a pedestrian, librarian Sharon Hamer, 67, leading to proposed traffic improvements in the square.

Updated on Sept. 2, 2020: The rider has been identified as Darryl Willis, 55. WCVB spoke with a witness who said he was riding without a helmet and was crushed when he and the truck tried to merge into the same lane.

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