Veteran Dateline producer Dan Slepian and JJ Velazquez join Kristen Welker for a “Meet the Moment” conversation to detail their 20+ year effort to free Velazquez from a wrongful murder criminal conviction. It’s a decades-long journey to freedom that was captured in Slepian’s new book, “The Sing Sing Files: One Journalist, Six Innocent Men, and a Twenty-Year Fight for Justice.”