"Letters from Sing Sing" Host and "Dateline" Producer Dan Slepian gives a special preview of "The Sing Sing Chronicles," a special two-night event presented by MSNBC Films. Building on decades of Dan's investigative reporting, the four-part documentary series from NBC News Studios and Director Dawn Porter exposes the injustices of different wrongful convictions at the notorious Sing Sing prison. The first two episodes of "The Sing Sing Chronicles" premiere Saturday, November 23rd at 9pm ET, and the final two episodes air Sunday, November 24th at 9pm ET on MSNBC.