The death of an Italian man whose body was found at a house in Greater Manchester has "left an unbearable emptiness", his family have said.
Giorgio Roncari, who was also known as Giuseppe, was discovered in Blackburn Street, Salford, on 17 April.
Police said a post-mortem examination had failed to establish the cause of his death.
The 61-year-old's family said he had been a "loving uncle" and "a twin brother with a big heart".
Det Insp Andy Butterworth said a murder investigation was continuing and officers were "actively searching for those responsible for his death".