What happens to bail (bond) money if the criminal is killed while out on bond?

Suppose there is a suspect/criminal that is arrested. He is able to post a bail bond to the city or county to guarantee his court appearance, so he is released from the jail.

Then he dies (maybe a natural death, maybe he is killed in the commission of another crime. It doesn’t matter.)

What happens to the bail money? Does the city / county keep it? (because the guy clearly won’t be appearing before the court if he’s dead)

Or does the city/county nullify the bond and return the funds to the criminal’s family (or bond provider)?