A person was killed after being struck by a semi-truck on Saturday near White River on Saturday on Highway 83.  According to the Mellette County Sherrif’s Office at approximately 11am, a semi-truck traveling south bound on US Highway 83 struck a female, approximately eight miles south of White River.  who was pronounced deceased at the scene. The Rosebud Sioux Tribal Police are investigating the incident. Further details will be released in the coming days.