An argument between two brothers Tuesday afternoon left one Fort Pierre man hospitalized the other under arrest.
Stanley County Sheriff Brad Rathbun said the injured 23-year-old brother drove himself to the hospital.
Rathbun was not sure of the extent of his injuries, but he was shot with a 22-caliber rifle.
The 20-year-old brother was arrested and was being questioned Tuesday afternoon.
Investigators haven't yet filed charges or released any names.