I think it is pretty obvious that Kip was suffering from something more than a mere liver issue. Sure, they can be the demise of a bird, but nothing like as quickly as Kip has succumbed to his problems. From what we have seen on this forum, liver issues are a chronic problem, not an acute one.
We are not Vets, Avian or otherwise. If you have any serious doubts about your budgies' health an appointment with an Avian vet should always be your first point of call.