Luigi Mangione surveilled United Healthcare chief executive Brian Thompson the night before he allegedly shot him on a Midtown street and initially considered a different target, prosecutors in Manhattan said Wednesday in a new court filing.

Just before 8 p.m. on Dec. 3, 2024, prosecutors said Mangione was spotted walking near the Hilton Hotel. "He appeared to be talking on a cellphone, and as he walked down the street, Mr. Thompson walked past him in the opposite direction," the filing said.

As prosecutors have pored over a red notebook they said Mangione used as a diary, they say they found "unambiguous" evidence of Mangione's motive against the United Healthcare CEO.

"The entry dated August 15, 2024, reads in pertinent part as follows: 'I finally feel confident about what I will do.

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