Luigi Mangione, charged with the murder of Brian Thompson, was reportedly found with a notebook containing detailed plans for the shooting.

Luigi Mangione's defense attorney said he has seen "no evidence" linking his client to the killing, adding that "a lot of guns look the same."

The man charged with killing UnitedHealthcare CEO Brian Thompson on a Manhattan street was seen near a Port Authority bus station 46 minutes after the shocking crime, New York police said, before he made his way to Pennsylvania, where he was eventually arrested.