KETCHUM - One motorcyclist died and four others were seriously injured Sunday afternoon in a multiple-vehicle crash on Idaho 75, near Galena Summit.

According to Idaho State Police, 26-year-old Kimberly R. Hayes, of Boise, was riding northbound with a group of motorcyclists when she failed to negotiate a curve, crossed the center line and sideswiped a trailer being hauled by a southbound pickup truck.

Another motorcyclist in the group - 57-year-old Michael A. Jones of Nampa - struck Hayes, and both motorcycles went down, police said. A third rider, 46-year-old Jason Clark of Meridian, attempted to avoid the wreck, but lost control of his bike and also went down.

Police say Hayes died at the scene. The other two riders each had a passenger on their bikes with them, identified as 54-year-old Dana Simmons of Meridian and 45-year-old Julie Clark of Meridian. All four were taken by air ambulance to Saint Alphonsus Regional Medical Center in Boise.

Simmons was the only rider not wearing a helmet when the wrecks happened.

Both lanes of the highway were blocked for several hours while police investigated the crash.

Although Camp Rainbow Gold used motorcycle riders to escort sick children to camp Tuesday, organizers confirmed that the motorcyclists involved in this crash were not part of their group.