's husband Peter Murrell, who recently stepped down as SNP chief executive, was also arrested as part of the investigation and was released after nearly 12 hours in custody without charge pending further investigation.
Mr Beattie said in a statement:"This afternoon I informed the party leader that I will be stepping back from my role as SNP National Treasurer with immediate effect. "I have also informed the SNP Chief Whip at Holyrood that I will be stepping back from my role on the Public Audit Committee until the Police investigation has concluded.
"On a personal level, this decision has not been easy, but it is the right decision to avoid further distraction to the important work being led by Humza Yousaf to improve the SNP's governance and transparency.
Try finding a treasurer willing to take the job without being told where the money is?