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ALL-NEW TONIGHT at 9/8c: Justice for Kristin Smart In a network exclusive, Kristin Smart's parents sit down with Josh Mankiewicz following the arrest and conviction of their daughter's killer. Watch the all-new 2-hour episode tonight, March 31 at 9/8c on NBC. Watch Now SUNDAY at 7/6c: Secrets by the Bay After the body of missing mother Elizabeth Sullivan is discovered nearly two years after she vanished, medical examiners begin to question when she died. Keith Morrison reports Sunday, April 2 at 7/6c on NBC. Watch Now LISTEN NOW: The Girl in the Blue Mustang Episode 4 After three trials, a verdict. But one Dateline viewer could change everything… You'll hear more about that in episode 4 of Keith Morrison's new podcast, "The Girl in the Blue Mustang." It's available now, for free, wherever you get your podcasts. And if you subscribe to Dateline Premium on Apple Podcasts, you can listen ad-free and get early access to episode 5 now. Read More BINGE NOW: Letters from Sing Sing Podcast All eight episodes of "Letters from Sing Sing," a new podcast from NBC News Studios, is available to binge now, wherever you get your podcasts. Read More Twin sisters hoping for new clues in 1970s deaths of their parents 52-year-old John Leonard was murdered on September 8, 1970, in Barrett Township, Pennsylvania. Three years later, his estranged wife, Madeleine Leonard, was found dead. Their daughters believe the deaths are connected. The Monroe County District Attorney's Office is investigating John Leonard's murder. Read More Happy birthday to US! In honor of our 31st birthday TODAY, we've decided to do a Dateline 24/7 marathon all weekend long! Join us on Peacock TV for the Bad Blood Marathon starting Saturday, April 1. Read More LATEST NEWS Husband of missing Massachusetts woman Ana Walshe indicted on murder charges Woman framed in 'rape fantasy' plot speaks out after conviction of ex-U.S. marshal Get the NBC News Mobile App Follow NBC News Check out all of NBCNEWS Newsletters here. Update Preferences | Unsubscribe | Contact | Privacy Update Preferences Unsubscribe Contact Privacy