Ra's al Ghul
After killing Niles Winthrop and later Alex Winthrop in front of Bruce and Gordon, Ra's al Ghul surrenders and is remanded to Blackgate Penitentiary to await trial. While also transferring some of his energy to a visiting Barbara, Ra's al Ghul also had some of his men infiltrate Blackgate Penitentiary by posing as the prison guards. After doing a threat to Bruce Wayne to return to bother him when he starts a family, Bruce reluctantly uses the embalming knife on Ra's al Ghul which reduces him to a skeleton just as Gordon and Alfred arrive. Gordon came up with a cover story that Ra's al Ghul's men infiltrated the prison and made off with him.