When Someone Has Liver Failure, What Is the Thing that Kills Them?

Obviously liver failure means death after a very short amount of time but what is the thing that most people die from when their liver is failing? In other words, what is the job that the liver is no longer doing that is the most damaging to the body? Is it ammonia build up in the blood stream? Is it the lack of bile to break down certain foods? Is it lack of hormone production? What is the most deadly aspect of liver failure?