One person was killed Wednesday morning in a one-vehicle rollover accident on U.S. Highway 40 west of Lawrence, according to a Kansas Highway Patrol report.

Patrick D. Henderson, a 34-year-old Perry resident, died after his 1992 GMC pickup truck .

Law enforcement officers were called just after 8:20 a.m., and found that the truck was westbound on the highway about six miles west of the South Lawrence Trafficway when the right side tires went off the road for an unknown reason.

It struck a Kansas Department of Transportation Chevron sign and continued into a ditch, where it overturned several times, striking a tree row and a fence, the report said. The exact time of the accident is still under investigation.

Henderson, the only passenger in the truck, was wearing his safety belt at the time of the crash, the report said.