In this episode of Up Close, we dive deeper into a murder case that has both horrified and captivated New York City, and the nation: the assassination of a healthcare CEO in Midtown Manhattan.

Supporters of the suspect are donating tens of thousands of dollars for a defense fund established for him, leaving law enforcement officials worried Mangione is being turned into a martyr.

Indications are that the defendant may waive, but that waiver is not complete until a court proceeding,” Alvin Bragg said.

NEW YORK -- Luigi Mangione's mother filed a missing persons report about her son in San Francisco on Nov. 18 -- 16 days ...

The UnitedHealthcare CEO’s alleged murderer pulled a star-powered connection with counsel linked to hip hop mogul Sean “Diddy” Combs. (Video: CNN) Less than two weeks after he […] ...

Luigi Mangione, accused of killing UnitedHealthcare’s CEO in Manhattan, has retained a high-profile New York attorney – a ...

Mangione appears to have been inspired by the Unabomber, according to an NYPD intel analysis report obtained by ABC News. The ...

Luigi Mangione faces a second-degree murder charge and four additional charges in New York in connection to the killing of ...

The conversation followed a tip that the FBI received from police in San Francisco, where Mangione's mother had filed a ...

Luigi Mangione has hired veteran former New York City prosecutor Karen Friedman Agnifilo to defend him against murder charges ...