National newspaper Aftonbladet reported that the man had a wound on the back of his head. His body was discovered on Thursday.
“As far as injuries go, I’m not going to comment on anything,” said investigative leader Berit Blick to news agency TT.
The police have yet to apprehend a suspect for the murder.
Nearby neighbours told the newspaper that they heard gunfire on Wednesday evening. The police are aware of this, but are currently unwilling to comment.
“We’ve heard about it, and are moving forward without preconceptions,” said Blick.
The police are also unwilling to comment on whether or not a former tenant is among those interrogated.
“I don’t want to discuss who we’ve interrogated, but our work continues,” she said.
The police want witnesses who were in the area on Wednesday and Thursday to contact them.