Deleting a user via data manager - HELP!!

[AustinKalb]

This script fails in the data manager delete method here (class_dm_user.php, line 1953):

		if (!$this->existing['userid'])
		{
			return false;
		}

I know there is a user with a uid 36 !!

	define('THIS_SCRIPT', 'deleteVbUser.php');

	require_once('./global.php');
	require_once('./includes/class_dm.php');
	require_once('./includes/class_dm_user.php');

	$userdm = new vB_DataManager_User($vbulletin, ERRTYPE_ARRAY);
	
	$userdm->set('userid', '36');
	
	if (count($userdm->errors)) {
		for($i=0; $i<count($userdm->errors); $i++) {
			print "ERROR{$i}:{$userdm->errors[$i]}\n";
		}
	} else {
		# If everything is OK
		$result = $userdm->delete();
	}
	
	if (!$result) {
		echo "result: false <br />";
	} else {
		echo "result: $result <br />";
	}

Got to be something simple. Please - any help?

Thanks!
Austin

==================
Answered myself - following properly sets uid:

$existing = array( 
    'userid' => 36, 
    'username' => 'AAAphpNukeUser', 
    'usergroupid' => 9, 
    // ...and all the other fields related to a user 
);  	
	$userdm->set_existing(&$existing);