An appeal by a man against his conviction for the murder of rugby player Shane Geoghegan in a case of mistaken identity has been dismissed by a six to one majority in the Supreme Court.

A seven-judge Supreme Court has unanimously refused to order a retrial of a man lawfully acquitted of burglary charges in 2012 under a rule of evidence controversially altered earlier this year by a four to three majority of the court.

A mother who objects to her son getting his