https://www.msn.com/en-us/news/crime/police-appear-to-be-closing-in-on-name-of-gunman-who-shot-ceo-sources/ar-AA1vjmLU?ocid=BingNewsBrowse
Looking back at the video, it doesn't appear the shooter is wearing gloves. I wonder if he wants to eventually be caught so he can "tell his story".
EDIT: The NY Post has a story indicating that the words were found on shell casings AND three unfired rounds which were left at the crime scene. That would explain why he manually racked the slide after each shot. He wasn't clearing a malfunction; he was making sure the message got sent.
https://nypost.com/2024/12/05/us-news/unitedhealthcare-ceo-brian-thompsons-assassin-may-have-left-message-on-bullets-used-in-murder-sources/