The family of a Wigan dad who died after being found unconscious on Fathers Day have paid tribute to him.
Detectives from the force Major Incident Team are now investigating the death of Francis Farrell, 56, as murder.
Francis was found with a head injury at around 4.10am on Sunday 17 June 2012, on Frog Lane, Wigan.
He suffered a serious head injury. He was taken to hospital for treatment, where he died on Wednesday 20 June 2012.
A post mortem examination has now revealed that Francis died as a result of a head injury.
In a statement, Francis's family said:
"Francis was a good son, brother and uncle. He kept himself to himself and was a quiet person. Francis lived his life how he wished and would cause no harm to anyone.
"We as a family cannot understand why this tragedy has happened.
"If anyone has any information big or small please come forward to give our family closure.
"We would also like to thank everyone for everything that was done for Francis whilst he was in hospital and for the many cards and thoughts of condolence that we have received.
"Francis son and grandson have both said how much they are missing him."
It is known that Francis had been drinking in various pubs within Wigan town centre on the Saturday evening into the early hours of Sunday 17 June.
He was last seen leaving Wiend Bar in Wigan town centre at about 3.50am. He was then seen on CCTV walking down Frog Lane at 3.58am and a passerby who found him called the ambulance service at about 4.10am.
Francis was wearing a black fleece jacket, light blue jeans, black shoes, and a black hat.
Francis was known locally to his friends as Fran, France, and Franny.
Detective Chief Inspector Joanne Rawlinson, said: "Francis was a 56 year-old man, who was much loved by his family and friends.
"He was attacked on Sunday 17 June, Fathers Day, while minding his own business on his way home after enjoying an evening out in Wigan town centre
"Whoever is responsible left him injured, unconscious and lying half in the road on Frog Lane.
"I believe that someone out there knows exactly how Francis came by his injuries that night. I would urge them to think about what Francis's family are going through, and to call me with whatever information they have.
"In particular I would like to hear from anyone who saw Francis in Wigan town centre that night.
"I would also like to hear from anyone who was in a vehicle or walking along Frog Lane between 4am and 4.15am, Sunday morning 17 June.
"It is very important that you contact the incident room as you may well have seen something crucial to the investigation and may not realise the importance of what you saw.
"From CCTV it is clear that there were a number of vehicles and pedestrians in the area at that time and I would really like to speak to them."
A 35-year-old man has been arrested on suspicion of assault. He has been bailed until 19 July 2012 pending further inquires.
Anyone with any information should contact the police on 0161 856 5448.