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.

Shooting suspect Luigi Mangione suffered with back pain due to spondylolisthesis, a condition where spinal bones are misaligned.