Chris Thompson, who had a wife and young son and worked at Flight Centre, was rushed to hospital but later died of his injuries.
Anton Oakes has convictions for offences against a former partner and was on bail at the time.
Ian McMeekin, defending, said Oakes felt ‘bitter regret, revulsion, utter grief on behalf of the family and abject remorse for his conduct which led to such tragic consequences’.
Aidan Oakes, a father of four, was said to hold down a good job and have no problems with drink or drugs and no previous convictions of ‘particular significance’ by his barrister, Mark Ford.
Mr Ford said Aidan Oakes had been assaulted inside Totties, and made a ‘misjudgement’ outside the venue in a ‘confused and febrile situation’, thinking Daniel Kelly posed a threat to him mistakenly.
“Alcohol had been taken, it may have had a role to play in the judgements that were made,” Mr Ford said.