So where next for the police officers trying to solve the decade-old mystery of who murdered Alistair Wilson?
As the detectives leading the inquiry sift through hundreds of pieces of evidence, the dead banker’s family will be waiting, hoping and praying that one tiny scrap of information could provide the breakthrough that finally snares his killer.
Police believe there may be someone, somewhere who knows something important – but perhaps does not realise its significance
And even 10 years on from their initial appeal for help catching the gunman, members of the public are still coming forward to talk to officers.
A police spokesman said: “Following the media briefing on Monday to update on the investigation, the appeal for information was reiterated and as such members of the public have contacted Police Scotland following that briefing.
“The information received will be considered as part of a review.
“It is encouraging that the public are still responding after this period of time and Police Scotland would ask that anyone with information please contact them on 101.”
Since the start of the inquiry – which has cost more than £2million – police have taken more then 4,100 statements, collected about 2,700 pieces of evidence and generated more than 11,000 tasks.
In Detective Superintendent Gary Flannigan’s word, officers are exploring “through every box” and looking at every word to find a breakthrough – an immense task.
He said: “Somebody out there knows something or perhaps suspects they know why Alistair was murdered.
“It’s not too late to come forward, and for the sake of Alistair’s family, I’d appeal to you to pick up the phone.”
Forensic techniques have moved on significantly in 10 years, meaning that existing evidence could still yield a vital clue.
It seems obvious that the murder weapon – the gun found discarded in a drain – could be subjected to further scientific tests.
The same, perhaps, also applies to the mystery cigarette butt found at the scene.
The DNA profile taken from it has apparently never been traced to an individual, making it another of the enduring mysteries of the baffling case.
But it is to the public that officers keep returning.
At the time of the murder, a £10,000 reward was offered by Crimestoppers to anyone with information leading to a conviction.
It failed to elicit the vital clue and the reward was withdrawn.
When a fresh appeal was made last year, new pictures of the small handgun used to shoot Mr Wilson were released, and the plea for information was backed by £5,000 Crimestoppers reward.
That reward is still on the table for anyone who can help crack the case.
The review is due to be complete within the next few weeks, and officers have promised that they will be back in front of the cameras to give an update on the investigation in the near future.
For the sake of Mr Wilson’s family, it can only be hoped that these renewed efforts will lead them to the killer.