Article continues below advertisementNotes Luigi Mangione took prior to his December 2024 arrest reveal the state of mind he appeared to be in after allegedly murdering UnitedHealthcare CEO Brian Thompson. Police said they discovered the notes, along with various other items - including a gun - in the 27-year-old's backpack after seizing it on December 9, 2024. "Keep momentum, FBI slower overnight," said one note, while another read, "Change hat, shoes, pluck eyebrows.