Police investigating the unsolved 1983 food ligament execution of a taxi operator successful Aberdeen person revealed they present person 200 imaginable familial matches to prosecute successful the hunt for the killer.
George "Dod" Murdoch, 58, was recovered dormant beside his vehicle, with the food ligament garrotte lying nearby.
A £50,000 reward has been connected connection successful the anticipation of helping to yet find the killer.
Ahead of Sunday's 41st day of the killing, Police Scotland said they would present effort to interaction radical from an archetypal database of 200 imaginable familial matches to found immoderate household nexus to a illustration from the scene.
Mr Murdoch picked up a fare successful Aberdeen's westbound extremity connected the evening of 29 September 1983, and told his power country helium was heading to Culter.
He ne'er made it to his destination.
About 2 miles into his fateful journey, helium turned disconnected connected to Pitfodels Station Road, connected the outskirts of the city, wherever helium was attacked and killed.
Two young cyclists saw him being assaulted and raised the alarm, but erstwhile officers arrived it was excessively late.
His woman Jessie - who aboriginal died successful 2004 - disquieted astir his safety, but helium had told her helium would ne'er defy a robber.
His wealth and wallet were stolen successful the attack, but it is not known if this was the motive.
A large probe was launched, but the slayer has ne'er been caught.
Forensic scientists antecedently managed to make a antheral DNA illustration from transgression country worldly acknowledgment to advances successful investigation techniques, but detectives request to find a match.
Senior investigating officer, Det Insp James Callander, said that what is described arsenic "familial DNA" list, formed with the assistance of the National Crime Agency, was a large beforehand successful the case.
He added that what had been recovered had been "further enhanced" to let officers to hunt for anyone related to the DNA sample.
Familial DNA searching is based upon the rule that DNA is inherited and each members of a household stock definite aspects of their DNA.
Det Insp Callander said: "This caller DNA information is important and volition assistance instrumentality america a measurement person to getting justness for Mr Murdoch's family.
"The familial DNA links identified volition assistance successful tracing radical who tin assistance with our inquiries.
"I privation to marque clear, these individuals are not suspects, but we anticipation they whitethorn beryllium capable to assistance with our ongoing investigation.
“I would inquire everyone to deliberation backmost to erstwhile George was murdered. If you person immoderate concerns astatine each from astir that time, delight don’t disregard them and interaction us.
“The solving of this horrific transgression requires the assistance of the public. I would impulse anyone with accusation to delight travel forward. We privation to springiness George’s household immoderate much-needed closure.”
In a statement, Mr Murdoch's household said: “This latest improvement with the familial DNA is simply a immense leap guardant and we convey the constabulary for their continued endeavour successful getting to this stage.
“It is precise encouraging and refreshes our anticipation that we tin yet place who is liable for Dod’s murder.”
Police Scotland tin beryllium contacted via 101 oregon emailed done a dedicated inbox astatine SCDHOLMESAberdeen@scotland.pnn.police.uk