According to court documents, on June 20, 2016, Coberley attacked a Lassen Volcanic National Park ranger who had been called out to investigate reports of a man walking in the middle of the road at 9:00 p.m., yelling loudly. When the ranger approached, Coberley jumped into the back of the ranger’s truck, grabbed a
This case was the product of an investigation by the National Parks Service and the Plumas County District Attorney's Office with assistance from the Plumas County Sheriff’s Office and the California Highway Patrol. Assistant U.S. Attorney Timothy H. Delgado prosecuted the case.
Lassen Volcanic National Park Chief Ranger John Fish stated: “The National Park Service would like to thank the U.S. Attorney’s Office and Plumas County District Attorney’s Office for their support in the successful prosecution of Mr. Coberly. Visitor and employee safety is of paramount importance to the National Park Service. We would further like to thank the Plumas County Sheriff’s Office and the CHP in helping resolve the situation with no injuries of significance to park visitors or our employee.”