Detectives investigating the murder of Tony Fisher in Carlton have made two more arrests overnight.
A 21-year-old man and a 31-year-old woman have been detained on suspicion of murder.
In further developments, nine people arrested on Tuesday, seven men and two women, have been bailed pending further enquiries.
And officers also said they arrested a 14-year-old boy on Thursday, who who has also been bailed.
The body of Mr Fisher, 58, was found at his home in Coningswath Road, on Saturday afternoon. He had been stabbed.
Officers are still keen to speak to anyone who knows anything about the incident.
They would also like to hear from anyone who saw or heard any suspicious activity in Coningswath Road at around 10.30pm to 11pm on Friday, January 8, and anyone who saw or spoke to Mr Fisher on that day.
Anyone who can help is asked to call the incident room on 0115 8446913.