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.

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.

Attorneys for the man accused of gunning down the UnitedHealthcare CEO last December now claim in a new court filing that Manhattan prosecutors wrongfully obtained Luigi Mangione’s medical records from his insurance carrier.