The 26-year-old addressed the crowd as he was taken into the Blair County Courthouse in Pennsylvania
He has been charged with one count of murder
Brian Thompson's suspected shooter Luigi Mangione was arrested on Monday (9 December)
Luigi Mangione was arrested yesterday over the fatal shooting of UnitedHealthcare's Brian Thompson
Luigi Mangione has been charged with the murder of UnitedHealthcare CEO Brian Thompson
Luigi Mangione has been charged with UnitedHealthcare CEO Brian Thompson's murder
A man has been detained in connection with the murder of UnitedHealthcare CEO, Brian Thompson
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UnitedHealthcare CEO Brian Thompson was shot last week outside the Hilton Hotel
Brian Thompson was shot in New York in the early hours of Wednesday morning (4 December) as he was leaving his hotel
Police know how the suspect escaped, they're still figuring out where he escaped to
Police believe they have more details about the assassin
Police released an image of a person of interest in the killing
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The assassin gunned down UnitedHealthcare's CEO Brian Thompson in New York before riding off on a bike
New York City Police called the shooting of UnitedHealthcare boss Brian Thompson a 'brazen, targeted attack'
A theory has emerged regarding the 'chilling message' killer reportedly left on bullets
Police found messages scratched onto the bullet casings