It was on February 10 this year that a seriously injured 31-year-old man was found in an apartment in Åtvidaberg.

The 31-year-old had been hit in the head with a hammer and stabbed in the legs.

He later died of his injuries.

The 31-year-old's father, who was registered at the address, was also subjected to severe violence at the time.

District Attorney Kajsa Malmström prosecutes the four suspects for "together and in concert" killing the 31-year-old and attempting to murder the father.