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Local, national and international news coverage.

Reporting of breaking news and developing stories in real time.

Investigators didn't know if Kathy Heckel was a missing person or murder victim; decades later the case is reopened by a new detective.

Discovering Alaska's untouched beauty, from bear watching to climbing pristine glaciers.

Weekend news coverage.

Weekend news coverage.

Weekend news coverage.

Coverage of the 113th edition of the cycling event.

Danielle and Dr. Pablo dive into the science of sleep with the help of drummer Gina Schock; through lab testing and immersive storytelling, the trio breaks down the main forces that control sleep and what happens when they stop working in harmony.

From Gleneagles Golf Club in Perthshire, Scotland.

From Icahn Stadium in New York.

Weekend news coverage.

Tom Llamas anchors the latest news, going beyond the headlines to see how lives are affected by the world around them.

News and features about performers, productions and the milieu.

A new group of ninjas enters the competition as the central regional qualifying rounds begin in Las Vegas with an updated obstacle course; hosts Matt Iseman and Akbar Gbajabiamila, along with co-host Zuri Hall, select their fastest pick of the night.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

Local, national and international news coverage.

Host Will Ferrell; Paul McCartney performs.