They did in series 7 but darryl got sent down again for laundering counterfeit cash and chris got sent down also but he was innocent because he was only there to talk darryl out of doing it. They were sent back to prison for 10 years, darryl tried to commit suicide but failed and in the revival of the show he was trying to rob a warehouse by going in through the roof but fell through and this killed him. Chris is still alive but is not in the show anymore i don't think.