Sentencing - As introduced, reduces the percentage of sentence that a person convicted of first degree murder on or after July 1, 1995, and sentenced to life imprisonment is required to serve before becoming eligible for release from 100 percent of 60 years less sentence credits earned and retained to 60 percent of 60 years less sentence credits earned and retained; prohibits a defendant becoming eligible for parole before serving 25 years of the sentence, if the defendant was 25 years of age or younger at the time of the offense, or 30 years of the sentence, if the defendant was 26 years of age or older at the time of the offense. - Amends TCA Title 37; Title 39, Chapter 13, Part 2 and Title 40.