Alper Pasha, 43, died four days after being hit over the head with a metal pipe outside a KFC restaurant in Brixton, south London.
He and his friends became involved in a confrontation with another group of men in Brixton Road at around 11pm on Thursday, 26 May, 2011.
CCTV cameras filmed Mr Pasha, from Bermondsey, being knocked to the floor outside KFC. He suffered a fractured skull and did not regain consciousness before his death in hospital on May 30.
On June 2, Monclair Bartley , 24 [04/10/86], of Knowlton House, Cowley Road, Stockwell, was charged with murder.
Bartley went on trial at the Old Bailey on October 8, 2012. The prosecution case was that Bartley attacked Mr Pasha from behind with a metal standpipe taken from a nearby Dynarod van. His DNA was found on the pole after the attack.
He claimed that he was trying to defend his friend after they were racially abused by Mr Pasha's group. He also claimed he did not intend to cause serious injury.
CCTV footage revealed the whole incident lasted just 84 seconds.
On October 16 Bartley was cleared of murder but convicted of manslaughter. He was jailed for nine years.
Detective Chief Inspector, Mandy Hargreaves, who lead the investigation for the HSCC said: "This was a senseless killing that escalated from an argument between these men. Bartley decided to arm himself with a weapon and deliver a fatal blow to Alper who was trying to avoid conflict by leaving the scene."