Neama Rahmani told Newsweek that jurors may be swayed by an outpouring of public sympathy for Mangione, who is accused of gunning down the CEO of medical insurance company UnitedHealthcare. Newsweek sought email comment from Mangione's attorney, Thomas Dickey, on Thursday.

Mr Mangione’s short note suggested a calculating desire to wreak revenge on America’s healthcare system. America, he correctly noted, has the most expensive health care in the world, but life expectancy has stagnated.

Independent journalist Ken Klippenstein released the full text of the “manifesto” written by murder suspect Luigi Mangione, in which he said health-care officials “had it coming.”