Police arrested Luigi Mangione on a forgery charge, and, once in custody, police searched his backpack, where they found a U.S. passport, clothes that matched the gunman’s description, a ghost gun with a suppressor that was consistent with the murder weapon and a three-page handwritten note. “We don’t think there’s any specific threats to others mentioned in that document, but it does seem he has some ill will toward corporate America,” NYPD Chief of Detectives Joseph Kenny said.

“He was very careful with trying to stay low profile, avoid cameras,” said Pennsylvania State Police Lt. Col. George Bivens. Investigators say the most crucial clue in the investigation was a photo from the hotel where the suspect pulled down his mask.

CBS News has learned Mangione is from a prominent Maryland family that owns country clubs, health care facilities and real estate companies. He graduated valedictorian from a private, all boys high school, got his Masters in Engineering from the University of Pennsylvania and also has ties to Stanford. A former classmate and childhood friend told CBS News he was nice, smart and didn’t have any enemies during his time at school.

CBS News has also learned Mangione had been living at a coworking, co-living space called Surfbreak in Honolulu up until 2022, when a spokesperson for that community said he left due to a lifelong back injury that was exacerbated by surfing and hiking. “I was roommates with him, friends. Hiked, went to yoga. He did his best to be athletic,” said R.J. Martin, a former roommate from Surfbreak. “Unfathomable knowing the kind of person that I saw and knew.” The spokesperson said they believe he returned to Hawaii in 2023 and started a book club, which they said several members left due to “discomfort in book choices.” Sources tell CBS News back pain was a major factor in his life and appeared to be a source of pain and frustration for him. “Personally, I can make zero sense of it,” Martin said. “There is never a justification for violence.”