A 27-year-old man is behind bars accused of assaulting a young child.
Authorities were called to an apartment on South Connie Street in southwestern Sioux Falls Wednesday night for an unresponsive two year old.
The toddler was taken to the hospital where police learned the child's injuries were not considered to be accidental.
Joseph Robert Patterson, the boyfriend of the toddler's mother, was watching the child when the call came in.
After an investigation, police arrested Patterson for aggravated battery of an infant and aggravated assault.
The young child remains in critical condition.