At almost exactly 1 p.m. on Friday, Luigi Mangione walked into a Manhattan federal courtroom through the back door. In his beige prison garb, flanked by US marshals, he looked expressionless, but as he sat and chatted with his attorney Marc Agnifilo, he broke into a couple of smiles.
For the duration of the 35-minute hearing, following Mangione’s federal indictment on charges of stalking and murdering health care CEO Brian Thompson, the defendant was mostly an observer. At 1:06 p.m., he had…

