Monday, Sioux Falls Police responded to reports of a suspicious death. On Tuesday, the death is now being investigated as a homicide.

Fifty-year-old Crescencio "Chris" Conde-Vargas was found dead from head injuries Monday in his northeast downtown Sioux Falls home. Police say evidence shows Conde-Vargas was in a struggle with someone before he died. Authorities found no evidence of anyone trying to break in and believe the man knew his killer.

Police have not pin-pointed a weapon yet and interviews are on-going in the early stages of the investigation.