Notify Admin when user expires from group

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I'm wondering if there is a way to setup admin notification when a user expires from a group. I have three user group all of which are scheduled to expire after a year. The admin needs to know when a user account is expired.

I've seen numerous forum threads discussing admin notification of site changes, but nothing about user changes.

http://www.concrete5.org/documentation/how-tos/developers/get-email...

Thank you.

Kim