Delaware State Police is investigating a fatal crash involving a work crew member and a Freightliner concrete pumper truck Tuesday.

On Feb. 19, at approximately 12:57 p.m., a 2016 Freightliner concrete pumper truck was stopped on Hazlett Road within the Governors development, which is currently under construction, state police said.

While the vehicle was stopped, workers with another company began working behind the truck in a sewer with an open manhole cover in the roadway, police said. One worker was in the sewer while the other was standing at the top as a spotter.

Police said for unknown reasons, the truck driver failed to see the spotter near the open manhole cover and the spotter failed to see the truck backing up. As a result, the right rear tires struck worker.

The worker, a 29-year-old man from Georgetown, was pronounced deceased at the scene, police said. Identification is pending notification of next of kin.

The driver of the truck, a 43-year-old man from Lewes, was wearing a seat belt at the time of the collision and was not injured.

This accident continues to remain under investigation by the Delaware State Police Collision Reconstruction Unit.

Delaware news:Unmarked graves found at development project where African-Americans said to be buried

Delaware news:Indian River High School threat rumors under investigation: Officials