Luigi Mangione spent months meticulously planning to assassinate the head of America’s biggest health insurance company, his newly published diaries suggest.

Court documents filed by prosecutors show that Mr Mangione was in possession of a red notebook when he was arrested for the murder of Brian Thompson, the CEO of UnitedHealthcare, who was shot dead in the centre of Manhattan.

The diary, filed in evidence by prosecutors on Wednesday, was found on Mr Mangione when he was detained at a Pennsylvanian McDonald’s in December 2024 following a five-day manhunt .

In the notepad, Mr Mangione outlined his plot to carry out the killing, vented about his frustrations with the health insurance industry and focused on winning over public opinion, musing that his actions would garner even greater

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