Arlene Fraser's family has said her killer husband should remain in prison until he tells them what happened to her.

Her disappearance in 1998 sparked one of the biggest ever police investigations in Scotland and resulted in a murder conviction for her estranged husband.

Nat Fraser was sentenced to at least 17 years behind bars after a retrial in 2012, despite Arlene's body never being found.

Speaking to STV News ahead of the 20th anniversary of her death, her relatives admitted that they have given up hope that Fraser will reveal how she died, but say he should only be considered for parole if he finally tells the truth about what happened to Arlene.

Arlene's brother-in-law Steve Gillies said: "She shouldn't be forgotten.

"I don't think people, certainly in the north of Scotland have forgotten about her and I wouldn't want them to. Arlene is the focus of this and it's right and proper that she should be remembered."

Despite Nat's refusal to reveal any details Arlene's family is still hoping that someone out there will know the truth.

Steve said: "I just have a feeling that there will be something that'll happen, not tomorrow or next week but I think there are people out there who know a bit more about this than they've told and their conscience might be pricked by something to actually come forward to let us know what happened."

Arlene was last seen in April 1998 as she waved her children off to school.

Her disappearance sparked a major investigation and an appeal from her husband to come home.

But in 2003, five years after she was last seen, Nat Fraser was convicted of hiring a hitman to kill her after he learned that she was planning to divorce him.