Johnny Briscoe is a free man today, after serving 23 years for crimes the state now says he didn't commit. Briscoe walked out of a state prison in Charleston, Mo., on Wednesday after serving part of a 45-year sentence for convictions involving a 1982 sexual attack on a woman ... Thanks to DNA testing, authorities confirmed ... that Briscoe was innocent and that the real rapist was already in another Missouri prison. ... St. Louis County Prosecuting Attorney Robert P. McCulloch called him ... and "apologized to him on behalf of the county, particularly for the past six years." ......