I have do the same but you need to know the name of your agent for deletion, if you know such, you can run the delete by script.
This scipt is generated by CMS supervisor.
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Public Sub Main()
On Error Resume Next
cvsSrv.Dictionary.ACD = 1
b = cvsSrv.Dictionary.CreateOperation("Login Identifications",Op)
If b Then
Op.Window.Top = 6410
Op.Window.Left = 6600
Op.Window.Width = 6000
Op.Window.Height = 2540
Op.SetProperty "login_id","<<Agent Log ID>>"
Op.SetProperty "ag_name","<<Agent Full Name in CMS>>"
b = Op.DoAction("Delete")
End If
If Not cvsSrv.Interactive Then cvsSrv.ActiveTasks.Remove Op.TaskID
Set Op = Nothing
'## cvs_cmd_end
End Sub