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Manhunt: Luigi Mangione and the CEO Murder -- A Special Edition of 20/20

The secret life of the young man prosecutors allege gunned down United Healthcare's Brian Thompson; new details about the hunt for the suspect, examining what may have driven alleged killer Luigi Mangione to murder.

What Would You Do?

Using hidden cameras, host John Quiñones observes and comments on how ordinary people behave when they are confronted with dilemmas that require them either to take action or to walk by and mind their own business. Various scenarios are created that force people to make split-second -- and often surprising -- decisions, and variations of the situation (such as changing the genders, races or clothing of the people involved) are often featured to see if different reactions are elicited. Examples of situations on the show include a waitress being harassed by her boss, and a drunken valet trying to park cars.

ABC News Live Weekend: Saturday

Zombie Wells: The Threat Beneath

ABC News Live Special Programming.

ABC News Live Weekend: Saturday

The Playlist

ABC News Live sits down one-on-one with some of music's most influential artists to hear the story behind the sound.

20/20

Award-winning program anchored by David Muir, featuring unforgettable, character-driven true crime mysteries, exclusive newsmaker interviews, hard-hitting investigative reports and in-depth coverage of high profile stories.

20/20

Award-winning program anchored by David Muir, featuring unforgettable, character-driven true crime mysteries, exclusive newsmaker interviews, hard-hitting investigative reports and in-depth coverage of high profile stories.