A man who died on Wednesday night at 10 pm was found in the stairwell of an apartment building on Petloi on Upper Street.
The case is being investigated on the basis of current information as a homicide because there were signs of violence in the victim.
Police have arrested a Kuopio-based woman living in the apartment building on suspicion of a crime.
The victim and the suspect have known each other. Police will report more on the Friday afternoon.