Another motorcyclist was killed in Yellowstone National Park when his motorcycle crossed the center line and collided head-on with another vehicle on the Grand Loop Road between Norris and Mammoth Hot Springs, the second such fatality this summer. A young girl riding with him was injured and is stable condition.

Investigators are still trying to determine if Payne was wearing a helmet which was found at the scene.  The injured girl was wearing a helmet.

This is the second fatal motorcycle accident in the park this summer.