The third man arrested in connection with the murder of Grimsby man Peter Craven has been released under investigation.
Mr Craven, 48, died at the property in Oxford Street on Wednesday, August 15.
Two further men arrested in connection with his death have also been released. A 35-year-old man has been released on conditional bail, while a 47-year-old has been released with no further action.
Detective Chief Inspector Christine Calvert said: “We have a dedicated team following a number of lines of enquiry.
“If you have any information you think could assist us, please call us on 101, quoting log number 709 of August 15.
“If you would rather remain anonymous, you can also call Crimestoppers on 0800 555111.”