No Bond Hold This could happen if the defendant is considered a flight risk, poses a danger to others, or if there are reasons to believe they may tamper with evidence or intimidate witnesses. In such cases, the judge may issue a “no bond hold,” which means the person will remain in custody until their trial.
If he's still incarcerated and bail is $0 than he can't be bailed out. If there are no charges pending but he is still incarcerated then he likely took a plea and is serving a sentence.
Except as provided by Subsection (c), a person who is arrested without a warrant and who is detained in jail must be released on bond, in an amount not to exceed $10,000, not later than the 48th hour after the person's arrest if the person was arrested for a felony and a magistrate has not determined whether probable ...
A Personal Bond is a sworn agreement by the defendant that he/she will return to court as ordered and will comply with the conditions placed on his/her release.