Mr Murdoch’s nephew urged the public to “give us the answers we desperately want” even if it meant putting forward the name of a deceased relative, months after a £10,000 reward was offered by the family for a relevant DNA swab.
Detective Inspector James Callander, from Police Scotland’s Major Investigation Team, said: “George Murdoch’s family have dealt with his loss with a great deal of dignity over the years since his senseless murder.
The family of a taxi driver who was murdered with a cheesewire more than 40 years ago have issued a new plea for DNA from people who suspect a deceased relative may have been the killer.
In a public appeal on the 40th anniversary of his death, police said advancements in forensic analysis had enabled a DNA profile from the scene to be identified and enhanced to allow officers to search for anyone genetically linked.
Mr McKay described the police investigation as “diligent” but said he believed some people were resistant to giving their DNA.
