How to Disable users in Bugzilla
Users in Bugzilla cannot be deleted Bugzilla users cannot ( and shouldn't ) be deleted. This is a Bugzilla feature to avoid database corruption. However, users can be disabled so they don't show up on the drop-down menus (assign/cc, etc) to avoid confusion. Disable them in Bugzilla: Login to Bugzilla > Administration > click Users > Search for user ('real name' and typing lastname) > Click on user email ('Edit user...' column) > Type something on the 'Disable Text' box > Update After this they shouldn't show in the drop-down menus.