A triple homicide occurred outside the park in the town of Lodge Grass on the Crow Tribal Reservation on the afternoon of October 4th. Rangers were soon notified that the suspect, Sheldon Chase, had been seen on Good Luck Road, travelling towards the Fort Smith area, where park headquarters is located. Chase was believed to be armed with a handgun and possible a high-powered rifle. Fort Smith Elementary School, located in Government Camp, was immediately put on lockdown and rangers responded to assist with the search for Chase. Rangers met with Bureau of Indian Affairs police and US marshals to coordinate a hasty search of all surrounding roads and river access areas, as well as the town of Fort Smith. During the search for Chase, it was learned the victims were family members of a Bighorn Canyon NPS employee. The park is providing assistance to the employee.