WATERBURY, Conn. (WTNH) — A Danbury man was killed in a crash involving a tractor-trailer on I-84 West in Waterbury Thursday night.

State police said a tractor-trailer and Chevrolet Silverado were on I-84 West near exit 23 in Waterbury around 8:30 p.m. Thursday when the driver of the Silverado didn’t slow down due to traffic, hitting the tractor-trailer from behind.

The driver of the tractor-trailer was taken to St. Mary’s Hospital. Their condition is unknown.

The driver of the Silverado, identified by state police as 20-year-old Zachary James Carlson from Danbury, was pronounced dead at the scene.

I-84 was shut down for several hours, but the highway has since reopened.

The investigation is ongoing. Anyone who may have witnessed the crash is asked to call Trooper Paustian at (203) 267-2200.