Heart Biopsy For Heart Failure?

Aimee Copeland Gets Bionic Hands

Touch Bionics donated prosthetics to Georgia woman, 25, who lost her hands to flesh-eating bacteria.

Wait Begins for Owner of Winning Powerball Ticket

One ticket worth a half-billion dollars was purchased in small Florida town of Zephyrhills.

Cops Kill Hofstra Student in Home Invasion Standoff

A police officer made a split-second decision when a man held Andrea Rebello hostage.

Aimee Copeland's Comeback After Flesh-Eating Bacteria

Woman who lost her limbs talks about her positive outlook on life.

$590 Million Powerball Ticket Sold in Florida

The search is on for the lucky person who purchased the winning ticket.

Yale Graduate's Essay Resonates After Death

Recent grad and promising writer Marina Keegan, 22, died in a car crash.

Will Jodi Arias Plead for Her Life?

The convicted killer will take the stand for jurors before they decide her sentence.

Tornado Chasers Catch Outbreak on Tape

ABC News' Ginger Zee chases tornadoes during a large breakout of storms.

Monster Twisters Caught on Tape

At least four tornadoes touch down in Kansas; heavy rain and winds on its way.

Powerball: $590 Million Winning Ticket Sold in Florida

A supermarket in Florida sold the winning ticket.

NY Parents of Murdered Kids Expecting a Baby

Marina and Kevin Krim's children were allegedly stabbed to death by their nanny.

Aimee Copeland on 'Katie': 'Love Life'

Flesh-eating disease survivor tells Katie Couric that she doesn't like being called "disabled."

Randy Pausch's Last Lecture: Wife's Take

Professor's wife writes book about caring for dying husband.

Police Accidentally Shoot Hofstra Student in Deadly Hostage Situation

Andrea Rebello was fatally shot by authorities in confrontation with alleged home , put in headlock