A Watertown man remains in the Codington County jail after he was arrested early Sunday morning at around 1:12 a.m. on an assault charge. Codington County Deputies responded to 1905 5th St, SE Watertown SD (South Fork Lounge) to investigate an assault that occurred. Jason Ralph Endres, age 28, of Watertown was arrested for simple assault on Jeremy Buol, age 40, of Watertown. Codington County Sheriff Brad Howell says that Buol was transported to Prairie Lakes Hospital and was later flown to Sanford Hospital in Sioux Falls with possible life-threatening injuries. Jason Endres was arrested for simple assault and, as mentioned earlier, is being held in the Codington County Detention Center on no bond. The Codington County Sheriff’s Office and the Division of Criminal Investigation are assisting with this active investigation.