Luigi Mangione, the man accused of fatally shooting United Healthcare CEO Brian Thompson in a case that sparked national attention, watched as new testimony and never-before-seen footage from the day of his arrest in a McDonald's was unveiled during a hearing this week.

Mr Mangione has pleaded not guilty to state charges related to the 2024 murder of Mr Thompson, a father of two, as well as federal counts that carry the possibility of the death penalty.

The pre-trial hearing is focused on the defence's attempts to keep certain evidence out of the trial, which has not been scheduled yet, including items found in his backpack during his arrest and statements he made to officers.

During the first two weeks of the hearing, supporters of Mr Mangione - the scion of a prominent Maryland family and Ivy League graduate - filled the back rows of the Manhattan criminal courtroom, some wearing a pin portraying him as a saint-like figure.

Prosecutors and Mr Mangione's legal team are expected to question over a dozen witnesses from the day of his arrest, including the employees who spotted him and the police who arrested him.