The family of Sheku Bayoh will on Monday learn whether police involved in his death will face prosecution.
Relatives of the Kirkcaldy man, who died while being detained by officers in 2015, have arrived in Edinburgh for crunch talks with the Lord Advocate James Wolff QC.
The law officer will advise the family of the outcome of a review of his decision last year not to prosecute. He cited the “complexity of the case” as a reason for his decision.
Mr Bayoh’s mother Aminata Bayoh, sisters Kadijartu Johnson and Adama Jalloh, and brother-in-law Adeyemi Johnson arrived at the Crown Office in Edinburgh on Monday morning accompanied by solicitor Aamer Anwar.
The family say the police officers involved in Mr Bayoh’s death were initially treated as witnesses rather than suspects.
They claim the case is a “fundamental test in the accountability of those who claim to be guardians of law and order”.
Father-of-two Mr Bayoh died in Victoria Hospital, Kirkcaldy, after being restrained by up to nine police officers who said they were responding to reports of a man acting erratically armed with a knife.
It is thought he suffocated as he lay face down with police on top of him.
The presence of drugs in his system may have contributed to his death.
The police officers involved have always denied any wrongdoing.
If the decision is made not to prosecute, a fatal accident inquiry will be held.