Okla. Stat. tit. 22, § 22-852: Juror must declare knowledge of case

If a juror have any personal knowledge respecting a fact in

controversy in a cause he must declare it in open court during the

trial. If, during the retirement of a jury, a juror declare a fact,

which could be evidence in the cause, as of his own knowledge, the

jury must return into court. In either of these cases, the juror

making the statement must be sworn as a witness and examined in the

presence of the parties.