A juror told two other jurors that she saw 2 African-American men in her neighborhood and that such an occurrence was unusual and she thought a conspiracy related to the trial. The other 2 jurors were sympathetic. The trial judge failed to remove the juror from the case and the defendant was convicted. Reversed on appeal.
http://www.judiciary.state.nj.us/opinions/a0211-12a3356-13.pdf
http://www.judiciary.state.nj.us/opinions/a0211-12a3356-13.pdf