Police said they recovered a red notebook at the time of Mangione’s arrest, detailing his frustrations with the health insurance industry and plans to carry out an attack.

Diary entries written by Luigi Mangione reveal the now 27-year-old’s detailed thinking ahead of the alleged killing of UnitedHealthcare CEO Brian Thompson last year, a new court filing shows.

Manhattan prosecutors said of Luigi Mangione’s handwritten diary entries, “If ever there were an open-and-shut case pointing to defendant’s guilt, this case is that case.” ...

(CNN) — Diary entries written by Luigi Mangione reveal the now 27-year-old’s detailed thinking before the killing of UnitedHealthcare CEO Brian Thompson last year, a new court filing shows.

Diary entries written by Luigi Mangione reveal the now 27-year-old’s detailed thinking ahead of the alleged killing of UnitedHealthcare CEO Brian Thompson last year, a new court filing shows.

By Dalia Faheid, CNN (CNN) — Diary entries written by Luigi Mangione reveal the now 27-year-old’s detailed thinking before the killing of UnitedHealthcare CEO Brian Thompson last year, a new ...

Diary entries written by Luigi Mangione reveal the now 27-year-old’s detailed thinking ahead of the alleged killing of UnitedHealthcare CEO Brian Thompson last year, a new court filing shows.

Diary entries written by Luigi Mangione reveal the now 27-year-old’s detailed thinking ahead of the alleged killing of UnitedHealthcare CEO Brian Thompson last year, a new court filing shows.

Diary entries written by Luigi Mangione reveal the now 27-year-old’s detailed thinking ahead of the alleged killing of UnitedHealthcare CEO Brian Thompson last year, a new court filing shows.

Diary entries written by Luigi Mangione reveal the now 27-year-old’s detailed thinking ahead of the alleged killing of UnitedHealthcare CEO Brian Thompson last year, a new court filing shows.