OAK GROVE, WI (WTAQ) - Authorities in western Wisconsin continue to investigate a weekend motorcycle crash that killed a 72-year-old rider.

Pierce County authorities said James Swenson of Trego rode into a ditch off Highway 35 in the town of Oak Grove.

It happened Saturday night, and Swenson died at the scene.

Pierce County sheriff’s deputies have been asking people’s help in determining what happened and why.