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The deleted_user action/hook can be used to perform additional actions after a user is deleted. For example, you can delete rows from custom tables created by a plugin.
The hook passes one parameter: the user's ID.
This hook runs after a user is deleted. The hook delete_user (delete vs deleted) runs before a user is deleted. Choose the appropriate hook for your needs. If you need access to user meta or fields from the user table, use delete_user.
User's deleted from Network Site installs may not trigger this hook. Be sure to use the wpmu_delete_user hook for those cases.
<?php add_action( 'deleted_user', 'function_name' ); ?>
where "function_name" is the name of the function to be called.