The bitcoin of the owner will remain in his/her wallet after he/sge died unless they tell their accounts and password to someone they know or to their family and relatives. It is better for the person to tell to his/her family to manage the bitcoin that will be left from them. In that way, he/she can still support his/her family through their financial needs even though they are already gone. Also, the family members will have the knowledge about bitcoin and other cryptocurrencies and earn or use it on their own.