Definitely. You need your liver to live. It's the master biochemist in the body; makes proteins, bile, clotting factors, detoxifies drugs, chemicals, poisons, etc. Death from liver failure usually is not pretty; can be associated with abdominal fluid collection (ascites), which can get infected, altered mental status (with or without coma), weight loss, bleeding from varicose veins of esophagus stomach, etc.
Yes. You need you liver to live? Once it fails, death may be as close as 2-3 years.