The family of murdered Aberdeen taxi driver George Murdoch believe his killing was premeditated as they launched an appeal for new information almost 40-years after his death.
George "Dod" Murdoch, 58, was found dead beside his taxi in September 1983, with a cheese wire garrotte lying nearby.
He had been beaten and strangled.
On the 38th anniversary of George's murder a £20,000 reward was offered in the hunt for the killer.
The 'cheesewire killer' was picked up in George's taxi and reportedly asked to be taken from Aberdeen to Peterculter.
George radioed into his control room at 8.35pm that night but around half an hour later two young boys witnessed George being attacked on Pitfodels Station Road.
The location was more than four miles short of his stated destination.
His wallet and fares from the night were stolen and the only trace ever found of the killer was a cheesewire used in the murder that was left at the scene.
In an appeal on BBC Crimewatch, Alex described George, nicknamed Dod, as an ordinary working man who was forced to become a taxi driver after being made redundant from a a factory job.
His wife Jessie often worried about him working the nightshift.
Alex said: "He said 'aww Jess if anyone tries to take my money etc I'm going to give it to them'. My uncle Dod was just not a fighter - he was not a fighter."
He added: "Dod was late and Jessie had been anxious in terms of when she got to see her husband again. Then there was a knock at the door.
"The police were there," Alec said before being overcome by emotion.
The family were then informed that George had been brutally murdered as a manhunt was launched when a police dog handler found him lying in a pool of blood, with severe injuries to his head, face and neck.
Alex said: "It was brutal, very brutal. Someone carrying a cheese-wire with them - what kind of person would do that? They're not using it for their work. It is premeditated - it has to be.
"It takes a special, callous individual to go out with something like that.
"Unfortunately of course after death of Dod her life (Jessie's) changed remarkably.
"Her health went into decline and she never ever spoke about Dod's murder but she never felt safe. She always thought that the killer was going to come back and harm her."
"Unfortunately she went to her grave not knowing who his murderer was. At times it makes me angry, sad that she was able to see justice."
George's family are still hopeful after all this time and hope their latest appeal for information might bring his killer to justice.
In a direct appeal to anyone who might know anything, Alex said: "For the family and also for those that have passed, you can't take something like that to your grave.
"I mean even if it is a hunch and it's a small piece of information, please share it.
"Small snippets of information from you might actually help us with small pieces of information from somebody else and we're able to start joining the dots.
"Closure to a family is like gold dust. It is something you crave for and you need. We certainly do, even after 38 years.
"A lot of people might say cold case murder who cares? The family care. We have always cared. We always will."
Detective Inspector James Callander also appeared on the show.
He said: “Regardless of how much time has passed, we continue receive a positive response from members of the public from all around the world when we appeal for information about this senseless murder.
“Over the years we have received sporadic information about what may have happened to George, and this is always investigated.
“It is apparent that many people will still have information that may help us bring closure to his family and it is hoped that today’s national television appeal may be seen by those people.
“Stories are passed on, or people remember something that may have seemed insignificant to them at the time, but is actually vital for us.
"We are urging anyone who has not come forward previously who believes they can assist the investigation to contact 101 or e-mail a dedicated inbox at SCDHOLMESAberdeen@scotland.pnn.poli."
Don't miss the latest news from around Scotland and beyond - Sign up to our daily newsletter here.
