Who is Luigi Mangione, suspect in the UnitedHealth CEO shooting?

Luigi Mangione, a 26-year-old former data engineer with a privileged background, has been arrested in connection with the fatal shooting of a UnitedHealth Group executive. Police found him with a homemade gun and an anti-capitalist manifesto. Mangione's online activity reveals admiration for the Unabomber and potential struggles with chronic back pain, raising questions about his motive.