Oklahoma City ? The Oklahoma Highway Patrol is asking the public for help in finding a pickup truck believed to be connected to a fatal crash that killed a Lawrence man in Carter County, Oklahoma.

The OHP said Tuesday that troopers are seeking an early 2000 Chevrolet single-cab pickup that is orange or yellow. The OHP says the truck carried two white males believed to be 17 to 20 years old.

Troopers say witnesses reported that the pickup was northbound Sunday afternoon on Interstate 35 near Ardmore when the driver made a left turn into the median and headed southbound on I-35.

A vehicle behind the pickup swerved to avoid the truck and crashed — killing 29-year-old Christopher Partee of Lawrence, Kansas.

The missing pickup was last seen exiting the interstate onto State Highway 142 at mile marker 33.