I know a person who has died from liver cancer last Saturday. I was just informed today. I would like to know some things.

How did he get liver cancer? He didn't drink, he looked healthy, he smoked occasionally but I doubt that had to do with the entire process. And how long did he have it for? By the time they checked him, it was too late, it had spread through his entire body. Can someone please tell me anymore ways that you know someone can get liver cancer? Thank you.