The death of a man who was found unconscious in a Cambridgeshire street is being treated as murder by police.
Peter Kofie, 49, was found by officers on patrol in Norwich Road, Wisbech, on Sunday night. He was taken to hospital where he later died.
A post-mortem examination concluded he died from a rupture to the artery in his neck caused by an assault, police said.
The attacker is described as 6ft (1.83m) tall and muscular or stocky.
He had short dark hair and and is in his late 20s to early 30s, police added.
He was wearing camouflage or combat style knee-length shorts and a horizontal striped dark and light top, believed to be brown and beige.
Listening to music
One of the two men he was with is described as about 5ft 6in (1.67m), aged 40 to 45, with a large dark brown or black dog on a lead.
The dog was long haired and possibly similar in appearance to a German Shepherd or Husky.
The other was about 50, of large build and had grey or greying hair.
It is believed the three men had been listening to live music being played at the Five Bells pub just before the assault and were stood on a grassed area opposite to the pub, near to a block of flats.
Mr Kofie was confronted and punched opposite the pub and attempted to flee along Norwich Road before being attacked and punched again.
The attacker then fled.
Det Ch Insp George Barr said: "The post-mortem has revealed Mr Kofie's death was a direct result of the assault so we are treating this as a murder investigation.
"I would like to speak to anyone who recognises the description of the attacker or was in the area at the time.
"In particular I would urge the two men who were with the attacker to come forward as they could have crucial information.
"And I would like to appeal directly to the attacker himself and urge him to do the right thing and come forward and speak to police officers.
"Any information, no matter how small or insignificant it may seem, could help us catch the person responsible."
An inquest into Mr Kofie's death is due to open in Wisbech on Wednesday.