Former media mogul Conrad Black is back in federal prison in Florida to finish his sentence for defrauding investors.

The 67-year-old ex-press baron whose empire once included the Chicago Sun-Times and London’s The Daily Telegraph checked into the Miami prison just after 1 p.m. yesterday, according to a prison official.

In June, a federal judge in Chicago sentenced Black to 3 1/2 years. Prosecutors said he would be given credit for more than two years he already served.