Former New York Police Commissioner Bernard Kerik, once selected to the U.S. Department of Homeland Security, was sentenced ... to four years in prison for tax evasion and lying to White House officials. Kerik, 54, who as head of the city's police worked closely with former Mayor Rudolph Giuliani at the time of the September 11, 2001 attacks, pleaded guilty to the federal charges in November. A former police detective, and once Giuliani's driver, Kerik headed the New York City jail system before taking charge of the police department in 2000. His career began to unravel during background checks when President George W. Bush nominated him in 2004 to become Secretary of Homeland Security. Kerik withdrew, but his legal troubles later embarrassed Giuliani in his unsuccessful bid for the 2008 Republican presidential nomination. Along with pleading guilty to lying and evading taxes, Kerik admitted receiving apartment renovations from a construction firm suspected of organized crime ties and helping the company win city contracts. The four-year sentence imposed ... exceeded the sentencing guidelines of less than three years, as laid out in Kerik's plea deal, but fell far short of the maximum possible term of 61 years.