Joey O'Callaghan who helped jail 2 gangland killers warned life is under threat again after releasing book The 36-year-old Dubliner feels he was abandoned by the State after helping to nail the two gangland killers Joey O'Callaghan Want the latest breaking news straight to your inbox? Sign up for our free newsletterInvalid EmailSomething went wrong, please try again later. Sign Up! When you subscribe we will use the information you provide to send you these newsletters. Your information will be used in accordance with ourPrivacy Notice. Thank you for subscribingWe have more newslettersShow me...