Luigi Mangione has pleaded not guilty to murder and terror charges in relation to the death of the CEO of UnitedHealthcare.
He has been charged with 11 murder and terror charges.
Prosecutors accuse Luigi Mangione of shooting Brian Thompson as he was walking to an investor conference in Manhattan, New York on the morning of December 4th.
The 26-year-old was formally charged last week by the Manhattan district attorney with multiple counts of murder, including murder as an act of terrorism.
Mr Mangione was detained in a Pennsylvania McDonald's after a five-day search, carrying a gun that matched the one used in the shooting and a fake ID, police said.
He was extradited from Pennsylvania on Thursday and quickly rushed to New York City.
Federal charges
As well as this state trial, he also faces federal charges.
The two cases will proceed on parallel tracks, prosecutors have said.
The state charges allege Mangione intended to "intimidate or coerce a civilian population" and influence policy, while the federal charges accuse him of stalking and killing someone.
According to federal prosecutors, the police who arrested him also found a notebook containing writing that expressed "hostility towards the health insurance industry and wealthy executives in particular".
Reporting by IRN.
Feature image shows Luigi Mangione, Alamy.
