Jefferson County authorities say a waste services employee has died at a landfill north of Lawrence.

Sheriff Jeff Herrig says the man, who died Friday morning, was an employee of Hamm Waste Services in Jefferson County.

The Kansas Highway Patrol identified him as 59-year-old Mark Wilson of Lawrence.

The patrol says the Wilson was operating a “tipper” machine that empties out large amounts of waste when he was pinned between a semi-trailer and a dock, causing fatal injuries.