The Brief

Court documents are shedding new light on the murder of United Healthcare CEO Brian Thompson.

New York state prosecutors say Luigi Mangione had a diary where he wrote about his plans to kill the healthcare executive, months before he was gunned down in New York City.

In Wednesday's 82-page filing, prosecutors justified adding terrorism to Mangione's first-degree murder charge.

NEW YORK (FOX 9) - Prosecutors say, to Mangione , Thompson and UnitedHealthcare were symbols of the healthcare industry and what the 27-year-old considered a deadly greed-fueled cartel.

What we know:

When Luigi Mangione was arrested by police in Altoona, Pennsylvania, last December, prosecutors say they recovered a red notebook he used as a diary among his possessions.

They say the diary includes

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