CHEROKEE COUNTY, Kan. — An area man died following an accident over the weekend when he was pinned against a pickup truck by a driverless tractor, according to the Kansas Highway Patrol. At about 11 a.m. Saturday, 73-year-old Joseph Carlson was working in a field at 2715 NW Liberty Rd. in rural Cherokee County when his Alias Chalmers tractor, which was running, moved for unknown reasons and pinned Carlson against his 2006 Chevrolet 1500 truck, according to the KHP.