In April 1998, Arlene Fraser, a mother of two young children, disappeared without trace. Her body was never found.
Five years later, three men stood accused of her murder. Only one man was convicted - her husband Nat Fraser. Samantha Poling uncovers damning new evidence which the jury was never allowed to hear.
The Arlene Fraser case has intrigued people for many years. Where did she go? Was she murdered? If so,who killed Arlene? Her husband Nat is in prison for her murder. There are so many questions in this case that have not been answered.
Is an innocent man in prison, suffering a miscarriage of Justice?
Detective Superintendent Jim Stephentold BBC Scotland's Frontline programme theirmajor concern was that they had no forensics, no crime scene and no body.
But he said he was determined to build a circumstantial case against Fraser.
Who killed Arlene Fraser?
During the police investigations, four potential candidates emerged: the three who were originally charged with murder - her husband, pig farmer Hector Dick and salesman Glenn Lucas - plus an unknown hitman.
The burden of suspicion has been passed from suspect to suspect since she disappeared. The first was Fraser himself. Facing having to pay out a hefty divorce settlement, he had the motive. He also had form, having nearly strangled Arlene to death just weeks both she disappeared.
But he had an alibi for the day Arlene went missing, April 28, which appeared watertight. Fraser spent the entire day on rounds in his fruit-and-veg van in the Elgin area with his van boy constantly at his side, and phone records showed he called a woman friend shortly after 9am and spoke to her for the best part of 45 minutes after arranging to make the call the previous day. It is believed that Arlene was kidnapped between 9.40am and 10am.
The only way he could have murdered his wife was to arrange for someone to kidnap her so Fraser could later kill her.
Doubting this possibility, but convinced Fraser had planned and was therefore guilty of the murder, detectives began to look at other people’s involvement in the case.
Lucas’s movements raised suspicions among investigating officers. He travelled to Scotland from Lincolnshire shortly before Arlene disappeared, and was seen in a pub in Elgin with Dick and Fraser on April 26. On the day she went missing, he went on a trip to the west coast before returning to his home in Spalding on April 29.
One legal source, who asked not to be named, said: "He claims to have an alibi in that he visited various places and relatives on the west coast, but his movements around the time Arlene disappeared are quite ludicrous.
"He was very like Nat in that he went to great pains to place himself at different locations at significant times. But if you look closely, he could easily have been in Elgin that morning for a short period of time."
With Fraser and Lucas both proffering alibis, suspicion began to fall on Dick, who attended Elgin Academy with Fraser and was best man at his wedding to Arlene in May 1987.
Exactly a week before Arlene disappeared, Dick was seen hanging about outside her house in Smith Street, Elgin. It was believed that Dick was carrying out a "recce mission" in preparation for Arlene’s murder the following Tuesday.
Dick, described as an accomplished liar,also bought and later destroyed a Ford Fiesta car for Fraser which it is thought was used to carry Arlene to her death or grave.
His connection to Arlene’s murder seemed almost as strong as Nat Fraser’s.
But Dick’s decision to give evidence against Fraser led to the prosecution dropping the case against him. Fraser’s defence team tried unsuccessfully to convince the jury that if anyone had killed Arlene, then it had to be Dick.
However, police viewed Dick as someone who was involved only in a relatively minor way. A member of the prosecution team revealed: "Dick holds the key to a lot of unanswered questions surrounding this case. He is up to his neck in it, but only as a bit-part player."