Luigi Mangione has pleaded not guilty in the December 4th shooting death of United Healthcare CEO Brian Thompson. Mangione voiced that not guilty plea to a judge Monday inside a New York City courtroom.

Mangione, 26, is expected to be turned over to the NYPD by federal agents in the morning and brought into state court for his arraignment on murder charges.

Luigi Mangione has officially pleaded not guilty after being charged with the murder of UnitedHealthcare CEO Brian Thompson. The 26-year-old entered not guilty pleas on Monday morning, December 23, in New York State court for 11 state counts — including first-degree murder,

A grinning Luigi Mangione appeared to yuk it up in a Manhattan courtroom Monday as he entered a plea in the murder of UnitedHealthcare CEO Brian Thompson.

Luigi Mangione, the suspected gunman in last week's killing of UnitedHealthcare CEO Brian Thompson, has been charged with murder. Reports described Mangione as the son of a prominent family in Baltimore who also surfed and worked in the tech industry.

Luigi Mangione is set to be arraigned Monday in Manhattan on the state indictment, according to Bragg's office. Here's what else he faces.

Luigi Mangione is being detained in Pennsylvania after being found with a gun consistent with the one used by kill UnitedHealthcare CEO Brian Thompson.