As a special preview for Dateline listeners, we’re sharing a sneak peek from the third episode of Letters from Sing Sing, a new original podcast from NBC News Studios hosted by longtime investigative reporter Dan Slepian. It’s a story that started in 2002 with a single letter from an incarcerated man claiming his innocence. 20 years later, it’s still unfolding. In this episode, JJ Velasquez discovers from his prison cell that detectives were looking at a different primary suspect before JJ’s name ever came up. Follow the podcast and listen to the first three episodes now: https://link.chtbl.com/lfss_et