Police have named the Sheffield murder victim as 22-year-old Fahim Hersi from the Broomhall area.
Mr Hersi was outside the cinema at Valley Centertainment when he was assaulted at around 9.20pm on Friday 21 September.
He was taken to hospital where he sadly passed away.
A post-mortem has concluded that Mr Hersi died as a result of a single stab wound to the chest.
His family has asked that their privacy be respected at this difficult time.
Seven people were arrested immediately after the incident on suspicion of murder.
A 21-year-old Sheffield man remains in police custody.
Two men and a woman, all from the Sheffield area, have been released under investigation.
Three men have been released with no further action.
Leading the investigation DCI Steve Handley said: “Our investigation remains on going and we would still like to hear from anyone in or around Centertainment on Friday evening.
“We would appeal for you to come forward and speak to us by calling 101 quoting incident 950 of 21 September 2018.”
You can also contact Crimestoppers anonymously on 0800 555 111.