Bernard Kerik, the former 9/11 hero later convicted of fraud charges, began serving a four-year sentence in federal prison Monday as inmate number 84888-054.
Kerik reported to the 1,500-inmate medium-security Federal Correctional Institution in Cumberland, Md., the New York Daily News reports.
Kerik, 54, pleaded guilty to tax fraud and seven other felonies, including lying to federal investigators, while he was under consideration for director of Homeland Security.