In one of his most memorable classic episodes, Josh Mankiewicz tells the story Eric Glisson, who was wrongly convicted of the 1995 murder of a Bronx cab driver. From behind bars, and with the help of those who believed in him, he was able to prove his innocence after serving 18 years of his life in jail for a crime he didn't commit. Eric opens up to Dateline about his life after his release.  Tune in to Dateline’s 30th season premiere Friday at 9/8c on NBC.