When you die and you still have debt when you die then if you have any income or money in the bank then the debt collectors can go after your last paycheck or your money in the bank.
That is unless you have a spouse and a joint bank account and then in that case they cannot remove the money from the Joint bank account.
If you are not married or have a joint bank account then the money can be taken by a court order to pay the debt.
Your assets can also be sold off by the county or government to pay back any debt owed as well if you are not married and the property is not jointly owned.
You should get a will in place so that the property you own or money you have gets distributed properly without things needing to go through probate.
But if you are dead and owe debt and you have no other people to pay the debt then there's nothing to worry about.
The debt will either be repaid with your assets or it may not.