Mangione pleads not guilty in killing of UnitedHealthcare CEO [Video]

Before being arrested and charged for the New York City murder of a health insurance company CEO, Luigi Mangione was a popular kid from a wealthy family, but friends say something changed about six months ago. CBC’s Ellen Mauro breaks down what’s known about the suspect’s path from privilege to prison.

Luigi Mangione pleaded not guilty on Friday to federal charges of gunning down health insurance executive Brian Thompson, a day after prosecutors formally stated their intent to seek the death penalty.

Mangione, 26, wore a tan jail-issued T-shirt as he was led into the packed lower Manhattan courtroom. He previously pleaded not guilty to a separate set of New York state charges over the Dec. 4 killing of Thompson, the former CEO of UnitedHealth Group’s insurance unit UnitedHealthcare.

He entered the plea at an arraignment before U.S. District Judge Margaret Garnett.

U.S. prosecutors formally told a court on Thursday …