AdminCustomersController for Newsletter Plus Prestashop module. It delete subscriber when a customer with the same email is created in the backend.

AdminCustomersController.php

<?php

class AdminCustomersController extends AdminCustomersControllerCore
{
	public function afterAdd($customer)
	{
		require_once _PS_MODULE_DIR_.'newsletterplus/newsletterplus.php';
		$newsletterplus = new Newsletterplus();
		$newsletterplus->hookActionCustomerAccountAdd(array(
			'_POST' => $_POST,
 		   	'newCustomer' =>	$customer,
		));

		parent::afterAdd();
	}
}