Judge Lance Ito today dismissed a juror in the trial because she was treated by O.J. Simpson's doctor for arthritis. Defense lawyers have claimed that one of the reasons O.J. could not have committed the murders is that he suffers from arthritis. The dismissed juror--a 63-year old white woman--was replaced by a 54-year old black man. The jury now consists of seven women and five men; nine jurors are black, one is white and two are of mixed race.