Two year old user account is showing up on meeting requests

An ex-administrative assistant is showing up on accepted meeting requests by the executive for which she used to be a delegate.

Her AD user account is long gone as is her mailbox.  How do I get rid of that association permanently?

We are using Exchange 2013 and Office 2013.
MatthewDKAsked:
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Amit KumarCommented:
1. Checked delegation of Executive and see if any unknown SID is there or go to Calendars then check permission on it remove if there is any unknown SID.

2. Any meeting which is accepted by assistant so you will have cancel that series and update it with new attendees.

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MatthewDKAuthor Commented:
Found some unknown SIDs in the Outlook permission entries for the executive's Inbox, Contacts, Tasks, and Notes.

Deleted them. Hope that does the trick.
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