Witness appeal after fatal street attack on student
Detectives searching for a student's killer say they "can't believe" witnesses have not come forward.
South Yorkshire Police believe half a dozen people saw the attack on Anowar Tagabo outside a nightclub in Sheffield on 25 May.
The 25-year-old University of Bradford student died in hospital nine days after he was assaulted on Carver Street near Viper Rooms at about 04:20 BST.
His family said he was a "kind, friendly and peace-loving young man".
A post mortem examination revealed he died as a result of a head injury.
Det Ch Insp Natalie Shaw is leading the murder investigation and has appealed for those who saw the attack to come forward.
She said: "I can't believe that no-one has yet had the courage to come forward and tell the police what they saw.
"From CCTV we can see that at least half a dozen people directly witnessed what happened.
"That includes the unknown male who was with Anowar at the time and who was chased from the scene by a group after the attack.
"If they are fearful in whatever way, I want to reassure them that they can contact police in confidence or ring Crimestoppers anonymously.
"Either way, we need to speak to that person and I would urge them to come forward."
Anowar's cousins Monsour Kitar, 34, and Bakheet Modeen, 25, from Leeds, said: "Our cousin and friend Anowar was a typical 25-year-old. He was a kind, friendly and peace-loving young man.
"He came to the UK for a better life for himself, away from all the war and unrest in his home of Sudan.
"Our family is devastated. His mother in Sudan is in pain and anguish at what has happened to her son."
Anowar, originally from Sudan, was studying peace and development in Bradford.