I have users appearing in the Users window in the r7 / r8 mart Security Manager that are no longer in my company. They will not be removed from the mart security even though I have deleted their SQL Server login accounts. What can I do to resolve that?

Description:  I have users appearing in the Users window in the r7 / r8 mart Security Manager that are no longer in my company.  They will not be removed from the mart security even though I have deleted their SQL Server login...