Updated

Six inmates have pleaded not guilty in connection with a fatal Delaware prison uprising that occurred earlier this year.

The six inmates, who are among 18 prisoners indicted in the February riot, pleaded not guilty at arraignments on Tuesday. All six demanded a jury trial.

Five of the six, including two already serving time for murder, are among 16 inmates charged with first-degree murder in the death of corrections officer Steven Floyd.

Prosecution of the defendants is likely to prove costly for taxpayers, as none of the 18 defendants can be represented by a public defender, based on conflicts of interest. Instead, they will be represented by private attorneys who are paid $90 an hour.