Father-to-be Danny Gough, 24, was hacked to death in front of his fiancee in Croydon, south London, on December 15, 2010.
He was at the home of his pregnant girlfriend Kareena Modashia in Stockbury Road, Woodside, when three masked men burst in during the early hours of the morning.
Police arrived at around 1.35am to find him lying in a pool of blood and he was pronounced dead at the scene. A post-mortem examination gave the cause of death as shock and haemorrhage from multiple wounds.
He had suffered stab wounds and deep cuts to his legs inflicted with a bladed weapon like a machete or axe.
On November 17, 2012, Stephen Dougherty, 34, [4/06/78], of no fixed address, was charged with murder. Two more suspects were charged with murder on April 4: Sam Monteith [1/8/81] of no fixed address and Paul West, 29 [7/1/84], of Eaton Avenue, Slough.
In January 2014 an Old Bailey jury failed to reach verdicts in the case against Dougherty and West after Monteith was ruled unfit to stand trial. The retrial of all three began on 5 November 2014.
The prosecution claimed Mr Gough was killed in a carefully planned revenge attack as part of an ongoing feud.
Prosecutor Mark Heywood QC said: 'This case concerns a truly vicious killing, it was motivated by vengeance and the need perhaps to maintain a degree of face.
'That vicious, extreme violence had a purpose, it was motivated by revenge and by the need to send a message, a message that the men involved were not to be trifled with.
'It was the direct result of an escalating feud between Dougherty, West and Monteith and the victim.'
Monteith had himself been cut and sprayed with ammonia home by three men a few weeks before the murder, the court heard.
It was alleged that Monteith accessed Mr Gough's Facebook page shortly before the murder. Mr Gough had recently updated it to say he was returning home from a weekend trip to Brighton.
The prosecution claimed Dougherty was linked to the crime by forensic and mobile phone evidence and left for Spain shortly after the murder. West was also said to be in the area at the time of the killing.
All three denied involvement and on 26 January 2015 the jury acquitted them of murder.
Contact the incident room on 020 8721 4155 or Crimestoppers on 0800 555 111.