Jurors in Manhattan sent a note on Friday to a judge overseeing the Daniel Penny trial saying that they had come to an impasse on whether he was culpable in the choking death of a disturbed subway passenger last year, leaving unresolved a case that has come to exemplify New York’s post-pandemic struggles.

After nearly three days of deliberations, the jurors — seven women and five men — wrote to the judge, Maxwell T. Wiley, saying: “At this time, we are unable to come to a unanimous vote on count one, manslaughter in the second degree.”

Justice Wiley responded by reading the jury a so-called Allen charge, official instructions for the jurors to resume their deliberations, with the goal of reaching an agreement through the reconsideration of differing opinions.

“It’s not uncommon for juries to believe they will never be able to reach a unanimous decision,” he said, adding: “I’ll ask you to continue deliberations on that count.”