BIRMINGHAM, Ala. — A Birmingham man previously convicted of murder has been sentenced to 20 years in prison on drug and firearm charges, according to the U.S. Attorney’s Office for the Northern District of Alabama. 33-year-old Francis Williams, who also goes by “Mookie,” was sentenced by U.S. District Judge Corey Maze to 20 years in prison, followed by 10 years of supervised release. In March, Williams pled guilty to distribution of methamphetam…