The judge overseeing the state trial of Luigi Mangione, the man accused of killing UnitedHealthcare chief executive Brian Thompson, has laid down the ground rules for court public and media access to the high-profile case. Mangione returned to court on Tuesday ahead of his murder trial, which begins next month in New York. The spectacle is likely to intensify when jury selection for the trial begins on 8 September. He faces a separate federal trial next year, in which he has also pleaded not guilty. Much of what is expected at the state trial – the prosecutor's case, Mangione's defence, and obstacles both parties face – were previewed in months of court filings and arguments, but some questions remain unanswered.