You can delete a role whenever you need to. 
  
    Important: Once a role is deleted all users and groups in the role will no longer
        have access to Records Management.
    - Click Define Roles in the Records Management Console.
 - In the Roles column, select the role you want to delete.
 - 
        Click Delete Role.
        
A message prompts you to confirm the action.
 - Click OK.