Rapid City Police are investigating an assault that put a man in the hospital with serious injuries.
Police spokesperson Tarah Heupel says the incident happened at the Hideaway Casino on North Lacrosse Street Tuesday afternoon.
The manager reported two men arguing. One punched the other - and as the victim fell - he hit his head on a cash machine.
The assault suspect fled. Police are hoping security footage from the casino will help them identify him.
The victim, a 46-year-old man from Rapid City, remains in critical condition.