RainLab\User\Controllers\Users::update_onDelete PHP Method

    public function update_onDelete($recordId = null)
    {
        $model = $this->formFindModelObject($recordId);
        $model->forceDelete();
        Flash::success(Lang::get('backend::lang.form.delete_success'));
        if ($redirect = $this->makeRedirect('delete', $model)) {
            return $redirect;
        }
    }