201306271029Robin Bain's hand to prove that he is the killer
The revelation was reported by TV3's 3rd Degree programme, after Waikato businessman David Giles noticed the marks in a crime scene photo and got in touch with David Bain's longtime supporter Joe Karam furnished apartments for rent.
Mr Bain spent 13 years in prison after being convicted in 1995 of shooting dead his father, mother, brother and two sisters at their Dunedin home.
The Privy Council quashed the convictions in 2007 and in 2009 Mr Bain was acquitted at a retrial craft organizers.
Mr Giles, who took an interest in Mr Bain's retrial, saw a photo of Robin Bain's hand online, and believed parallel lines on his thumb and forefinger were gunpowder residue associated with handling the magazine of the firearmbolt embroidery.
Specialist scientific photographer Peter Durrant, who Mr Bain's defence team brought in to further analyse the photo, said the marks were "quite consistent" with someone loading bullets into the gun.
Mr Bain's lawyer Michael Reed QC says the marks prove his innocence once and for all.
"It shows, in my opinion, a slam dunk. In addition to all the evidence we've already got ... it completely exonerates David," he told NZ Newswire.
"It shows Robin was the killer. He was handling the gun, he was loading it."
Mr Reed says police are "incompetent" for failing to notice the marks which were also missed by the original defence team and not presented in the 2009 retrial.
He is hopeful the revelation will spur progress on Mr Bain's compensation claim Asian college of knowledge management, which the government is considering, and that he will also receive a pardon.
Mr Reed suggested a judicial review they have instigated over Justice Minister Judith Collins' handling of the claim could be dropped if the government approves compensation.
Ms Collins rejected a report from retired Canadian judge Ian Binnie which found Mr Bain was innocent on the balance of probabilities, and recommended he be compensated.
A peer review found that report was "fundamentally flawed".
The government is not obliged to pay compensation but Mr Bain could receive about $2 million based on a previously used formula.
Ms Collins' office and police did not immediately respond to requests for comment.