Sitting Bull (Sioux: Tatanka Iyotake, Tatanka Iyotanka or Ta-Tanka I-Yotank, also nickname Slon-he or "Slow"; ca. 1831 – December 15, 1890) was a Hunkpapa Lakota Sioux holy man, born near the Grand River in South Dakota and killed by police on the Standing Rock Indian Reservation during an attempt to arrest him and prevent him from supporting the Ghost Dance movement.