Mr Lavelle, a father-of-two, was working in the area to save money for his wedding.
BBC: Reward increased for Kevin Lavelle 'dumbbell' pub murder
Kevin Lavelle, 29, died following a fight outside the Cricketer's Pub in Banbury in June 2004.
BBC: Reward increased for Kevin Lavelle 'dumbbell' pub murder
Mr Lavelle, a crane driver, was working in Banbury to save money for his wedding.
The Court of Appeal heard that no-one had been identified "in a public forum" as having killed Mr Lavelle.
The Justice for Kevin Lavelle Fund was set up by Mr Lavelle's family.
BBC: Reward for identity of Banbury killer raised to ?30,000
Paddy and Joan Lavelle are petitioning the Crown Prosecution Service (CPS) and Thames Valley Police to look again at the case.
Kevin Lavelle, 29, of Bootle, Merseyside, died after being fatally wounded with an iron dumbbell at The Cricketers Arms, Banbury, in June 2004.
Kevin Lavelle, 29, of Bootle, Merseyside, was attacked by a gang with an iron bar outside the Cricketer's pub, Banbury, in June 2004.
He said it was his case that Mr Noble or Mr Lawless or Mr Gibbs "jointly and severally caused the death" of Mr Lavelle.
Police say people from the Pontypridd area of Wales who were in the pub at the time Mr Lavelle was killed could be key witnesses.
BBC: Reward increased for Kevin Lavelle 'dumbbell' pub murder
Kevin Lavelle, 29, of Bootle, Merseyside, was attacked by a gang from Wales with an iron bar outside the Cricketer's pub, Banbury, in June 2004.
BBC: Reward for identity of Banbury killer raised to ?30,000
He told the appeal judges that Mr Lavelle's family felt aggrieved that nobody had been convicted and that they had been badly served by their legal team.
Ceri Noble, 44, of Rhondda, was charged with Mr Lavelle's murder but the court case collapsed in 2006 when it could not be proved who dealt the fatal blow.
BBC: Reward for identity of Banbury killer raised to ?30,000
Mr Cashin, along with Malcolm Francis, 19, of Constance Street, and Ijah Lavelle-Moore, 21, of Nottingham Road, all in the Basford area of Nottingham, also deny a charge of possessing a firearm.
But he added that was not the fault of Mr Noble or his legal advisers, and the court should "not be beguiled" into allowing the family, six-and-a-half years after Mr Lavelle's death, to start the process all over again.
Mr Lavelle had suffered 50 injuries.
BBC: Reward for identity of Banbury killer raised to ?30,000
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