how to remove zenoss user account?

i have recently downloaded zenoss core:
http://mac.softpedia.com/get/Network-Admin/Zenoss-Core.shtml
after installing the application decided to remove it so i deleted all the folders and file manually but the installation has created a user account which is not listed in the accounts section of preferences, i even deleted the zenoss folder under USERS folder and still persists.

anyway i can delete the user account forcefully, maybe in terminal?

Thanks