Mangione, who is accused of fatally shooting Thompson in Manhattan last year, has pleaded not guilty to federal and state charges. The 27-year-old faces the possibility of the death penalty if convicted. Prosecutors argue that Mangione murdered Thompson to make a statement against corporate greed.

The 27-year-old claims New York prosecutors faked a court date to nab 120 pages of his privileged medical history from Aetna, his insurer.

Defense attorneys for alleged UnitedHealthcare CEO shooter Luigi Mangione say prosecutors at the Manhattan district attorney's office are violating his health privacy rights by accessing confidential medical information, according to a court filing Thursday seeking a hearing and sanctions.