NEW YORK (AFP) - Former New York police commissioner Bernard Kerik was sentenced to four years in prison Thursday for corruption, tax fraud, and lying to the White House, the federal prosecutors office said. Kerik, 54, headed the police under New York mayor Rudolph Giuliani at the time of the September 11, 2001 attacks. He pleaded guilty in November and agreed to pay 187,931 dollars restitution. The plea helped him avoid a maximum potential sentence of up to 61 years in prison. However, the judge still imposed a sentence greater than that recommended by prosecutors. Kerik admits to accepting 255,000 dollars worth of renovations to his apartment from a construction firm angling for government contracts. The company which is suspected of having mob ties installed marble bathrooms, a Jacuzzi and a new kitchen in the former police chiefs apartment in the upscale New York suburb of Riverdale. Kerik then contacted regulators on behalf of the firm, but concealed the payments in tax returns as the firm was being investigated. He also pleaded guilty to lying to White house officials about the renovations while being considered as a future head of the Department of Homeland Security.