
Luigi Mangione’s bombshell diary entries have been released, revealing how he allegedly meticulously planned the assassination of UnitedHealthcare CEO Brian Thompson months before the December shooting in the heart of Manhattan.
In shocking court documents, filed Wednesday, prosecutors revealed Mangione was in possession of a red notebook diary when he was arrested at a McDonald’s in Altoona, Pennsylvania, at the end of a five-day manhunt.
The diary documented Mangione’s plot for the murder and his musings about how the Unabomber Ted Kaczynski got it wrong during his own reign of terror between 1978 and 1995, according to the filings.
In one entry from August 15, 2024, Mangione writes that he is ‘confident’ about his plan – four months before the shooting took place – and that it is ‘right/justified.’
‘I finally feel confident about what I will do. The details are coming together. And I don’t feel any doubt about whether it’s right/justified,’ his scrawling writing reads.
‘I’m glad-in a way-that I’ve procrastinated bc [sic] it allowed me to learn more about UHC [UnitedHealthcare].’
The same diary entry appears to suggest Mangione had previously considered a different target – detailed as ‘KMD’ – before deciding upon UnitedHealthcare, and its CEO.
‘KMD would have been an unjustified catastrophe that would be perceived mostly as sick, but more importantly unhelpful,’ he writes.
‘Would do nothing to spread awareness/improve people’s lives. The target is insurance. It checks every box.’
It is unclear what KMD refers to.
Luigi Mangione appears in court in Manhattan in February 2025 on charges of murder
In another diary entry dated two months later on October 10 2024, Mangione allegedly notes a countdown to the day of the attack: ‘1.5 months.’
‘So say you want to rebel against the deadly, greed fueled health insurance cartel. Do you bomb the HQ? No. Bombs=terrorism,’ the note reads.
‘Such actions appear the unjustified anger of someone who simply got sick/had bad luck and took their frustration out on the insurance industry, while recklessly endangering countless employees.’
Instead, he wrote of plans to ‘wack’ the CEO of the healthcare giant at ‘parasitic bean-counter convention’ as it ‘doesn’t risk innocents… The point is made in the news headline ‘Insurance CEO killed at annual investors conference.’’

Luigi Mangione ‘s bombshell diary entries reveal how he meticulously planned the alleged assassination of UnitedHealthcare CEO Brian Thompson

In another scrawling handwritten note shared in the new court filing, Mangione apologizes to the federal agents hunting for him
In another scrawling handwritten note shared in the new court filing, Mangione apologizes to the federal agents hunting for him.
The 27-year-old writes that he ‘respect[s]’ what they do, insisting that he acted alone and warning them that his tech is locked down.
‘I do apologize for any strife or trauma, but it had to be done,’ he added.
Despite his alleged confession, the 27-year-old has pleaded not guilty to both state and federal charges in connection with the December murder.
Federal prosecutors plan to seek the death penalty if he is convicted.
The 82-page document reveals new details about the hours leading up to the shooting, revealing that Mangione may have allegedly stalked Thompson the night before.

Mangione is accused of shooting UnitedHealthcare CEO Brian Thompson dead at point-blank range on December 4

Surveillance footage captures a masked killer shoot the healthcare exec dead in Manhattan
At around 7:47 p.m. on December 3, prosecutors allege Mangione was seen walking on West 54th Street and Sixth Avenue, adjacent to the Hilton Hotel.
He appeared to be talking on a cellphone.
While he walked along, Thompson was seen walking past him in the opposite direction, the documents reveal.
This may well have been a close call for the healthcare CEO.

Luigi Mangione is perp-walked by a string of law enforcement agents following his arrest
The next morning – December 4 – Thompson was gunned down outside the Hilton Hotel in Midtown Manhattan on his way to UnitedHealthcare’s annual conference.
Haunting surveillance footage captured a masked man walking up behind the 50-year-old father-of-two and shooting him dead at point blank range.
The suspect then fled on foot.
Mangione was finally arrested five days later and charged with the murder.