Video: Amy Winehouse's Last Days

Massive Tornado Devastates Oklahoma City Area, Dozens Killed

Elementary schools, homes and hospitals were destroyed in the monster twister's wake.

Tornado Outbreak: Destruction in the Heartland

The Midwest has suffered from three straight days of tornado activity.

Oklahoma Tornado: Search and Recovery

Oklahoma Lt. Gov. Todd Lamb gives "Nightline" the latest on rescue efforts in Moore, Okla.

Powerball Madness: More Than $600M Up for Grabs

Lotto fever sweeps the nation as one of the biggest jackpots in history approaches.

Ethan Hawke, Julie Delpy on 'Before Midnight'

Stars open up about their on-screen chemistry and off-screen heartache.

Two Brothers Tackle Alaskan Wilderness

Contestants on Nat Geo's "Ultimate Survival: Alaska" have to survive alone for days.

Powerball Madness: More Than $600M Up for Grabs

Lotto fever sweeps the nation as one of the biggest jackpots in history approaches.

Lone Survivor of 1987 Plane Crash Breaks Silence

In the documentary "Sole Survivor," Cecelia Crocker talks about living with survivor's guilt.

Demi Lovato: 'Warrior' For Life

Pop star talks about how fame can mean pain, and what she would say to Lindsay Lohan.

Clown School: Day in the Life

Students at San Francisco's Clown Conservatory pay $10,000 to learn the art of clowning.

O.J. Simpson Takes the Stand: What Happened in Hotel Room Hold-Up?

Former football star was convicted of armed robbery and kidnapping in 2008.

Know Your Klout: Users Can Score Big

"Nightline" goes inside the company that puts a number to your face, and it can earn you perks.