Who is Nine? Nine changed his vote because Juror number 8 had courage to stand against everyone else, and he 8 gambled for support and made 9 want to hear more.

Why did Juror 9 change his vote from guilty to not guilty?

It is Juror Nine, the elderly man on the jury, who changes his vote from guilty to not guilty at the end of Act One, and he is the first juror to do so. Juror Nine changes his vote to support Juror Eight, who wants to discuss the evidence before reaching a verdict. Juror Nine says he wants to hear more, also.

Why did Juror change his vote?

Changing His Vote

At first, the foreman votes that the defendant is guilty of killing his father but, in Act III of the play, he changes his vote to 'not guilty' when Juror Number Five is able to demonstrate that a switchblade would not be used from an upward angle because switchblades are used underhanded.