Season 2012 : Episode 0521
May 21: Join the party as Dateline celebrates some of its most memorable moments from the past 20 years and catches up on some of the show's most amazing stories. With Lester Holt, Ann Curry, Jane Pauley, Tom Brokaw, Matt Lauer and Hoda Kotb. Plus outstanding reporting from Chris Hansen, Josh Mankiewicz, Keith Morrison and Dennis Murphy. Tuesday at 10pm/9c.